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PSU Requirements

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Jack-Rabbit
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2020/09/30 07:52:32 (permalink)
Hey all, with the new 30 series cards, I know that EVGA has a requirement of 750w PSU for the 3080/3090.  Some other vendors states 850w for the 3090, are EVGA 3090 stable with a decent PSU of 750w?  IE Corsair HX750i
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    kevinc313
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    Re: PSU Requirements 2020/09/30 08:35:39 (permalink)
    Are you planning to run anything else off that PSU aside from the GPU? 
     
    The GPU alone will be just fine.  450w is well under 750w.
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    Jack-Rabbit
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    Re: PSU Requirements 2020/09/30 08:43:31 (permalink)
    cdrom - not really used
    3 HDD, 1SSD and 2 - M2 drives
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    kevinc313
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    Re: PSU Requirements 2020/09/30 08:46:29 (permalink)
    Jack-Rabbit
    cdrom - not really used
    3 HDD, 1SSD and 2 - M2 drives


     
    Is this one of those new CPU-less PC's I've been hearing about?  Very cool.
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    liud21
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    Re: PSU Requirements 2020/09/30 08:52:34 (permalink)
    850w is the bare minimum imo, I always like my pic components do never really run at full load.... I Always like have to an extra 100 or 150w of wiggle room... Also, if your psu constantly runs at near full capacity, the life of the psu will decrease over time. It's the one thing I don't want to fail in a PC, because there is a chance it will fry your other components...
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    RainStryke
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    Re: PSU Requirements 2020/09/30 08:57:43 (permalink)
    750w is minimum for a RTX 3090, if you want to overclock, I'd suggest a 850w or 1000w PSU... otherwise that Corsair HX750i would do just fine.
     
    Source:
    https://www.guru3d.com/articles_pages/geforce_rtx_3090_founder_review,7.html
     
     

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    terry2776
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    Re: PSU Requirements 2020/09/30 08:58:18 (permalink)
    My Silverstone Strider 1000W was giving me problems after the 3090 FTW3 Ultra install, now considering I have had it for 10 years I just ordered a new 1000W EVGA power supply to see if that is the issue. It should arrive later today so I can test tonight, in Metro Exodus it was rebooting my machine and I have never had that problem on any of my machines and it started after the new card.
     
    I am hoping it is degradation on my older power supply not being able to push the required power or I may have to look at 1200 or 1300W.

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    #7
    Jack-Rabbit
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    Re: PSU Requirements 2020/09/30 09:01:04 (permalink)
    kevinc313
    Jack-Rabbit
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    Is this one of those new CPU-less PC's I've been hearing about?  Very cool.
    no I have a 3800x ryzen, should of stated that. Funny how nvidia says 750 for all their 30 series.
    #8
    Jack-Rabbit
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    Re: PSU Requirements 2020/09/30 09:02:05 (permalink)
    terry2776
    My Silverstone Strider 1000W was giving me problems after the 3090 FTW3 Ultra install, now considering I have had it for 10 years I just ordered a new 1000W EVGA power supply to see if that is the issue. It should arrive later today so I can test tonight, in Metro Exodus it was rebooting my machine and I have never had that problem on any of my machines and it started after the new card.
     
    I am hoping it is degradation on my older power supply not being able to push the required power or I may have to look at 1200 or 1300W.
    it probably is the age. The components in the psu degrade over time.
    #9
    JayManB
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    Re: PSU Requirements 2020/09/30 09:14:09 (permalink)
    You'll more than likely be fine.  I watched a youtube video of a SFF builder who was using corsairs SF600 and it was fine.  This was with a 3080 though. Still close enough for comparison.
     
    What Video card do you have now?  I know my 1080Ti uses around 260w at 100% gaming load.  So I could for instance use a Kill O Watt and just add 100 watts for a 3090 than do a little math for efficiency than I would know what my system will require from my PSU.
     
    I think most systems will be pulling around 550 from the wall with a 3090 and a reasonably OCd CPU.
     
    I like to overspec my PSUs a little though it keeps them running in their quiet modes.
     
     
     
     
    #10
    Jack-Rabbit
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    Re: PSU Requirements 2020/09/30 09:29:23 (permalink)
    JayManB
    You'll more than likely be fine.  I watched a youtube video of a SFF builder who was using corsairs SF600 and it was fine.  This was with a 3080 though. Still close enough for comparison.
     
    What Video card do you have now?  I know my 1080Ti uses around 260w at 100% gaming load.  So I could for instance use a Kill O Watt and just add 100 watts for a 3090 than do a little math for efficiency than I would know what my system will require from my PSU.
     
    I think most systems will be pulling around 550 from the wall with a 3090 and a reasonably OCd CPU.
     
    I like to overspec my PSUs a little though it keeps them running in their quiet modes.
     
     
     
     
    I have a 1070. I skipped the 20 series. But with step up might as well get 2 birds one stone
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    HeavyHemi
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    Re: PSU Requirements 2020/09/30 09:32:07 (permalink)
    kevinc313
    Are you planning to run anything else off that PSU aside from the GPU? 
     
    The GPU alone will be just fine.  450w is well under 750w.


    Well, probably the rest of the PC.

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    EVGA_JacobF
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    Re: PSU Requirements 2020/09/30 09:34:54 (permalink)
    750W is good as long as it is a quality PSU.


    #13
    Jacob.jenson6
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    Re: PSU Requirements 2020/09/30 10:01:03 (permalink)
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.
    https://www.evga.com/power-meter/
    https://seasonic.com/wattage-calculator

    https://www.modsrigs.com/detail.aspx?BuildID=42222
    #14
    R3L3NTL3SS
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    Re: PSU Requirements 2020/09/30 10:23:23 (permalink)
    People are using 650W with 3080's and not having problems. 750+ should be just fine for a 3080.
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    Jack-Rabbit
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    Re: PSU Requirements 2020/09/30 10:32:56 (permalink)
    Jacob.jenson6
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.




    Thanks for the info.
    #16
    JayManB
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    Re: PSU Requirements 2020/09/30 10:42:09 (permalink)
    Jacob.jenson6
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.
    https://www.evga.com/power-meter/
    https://seasonic.com/wattage-calculator




    I'm not doubting you but have you actually hooked a kill o watt up to your system to see how much power you're pulling.  I think you would be suprised to see its much less than 800W.
     
     
    #17
    R3L3NTL3SS
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    Re: PSU Requirements 2020/09/30 10:44:46 (permalink)
    JayManB
    Jacob.jenson6
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.
    https://www.evga.com/power-meter/
    https://seasonic.com/wattage-calculator




    I'm not doubting you but have you actually hooked a kill o watt up to your system to see how much power you're pulling.  I think you would be suprised to see its much less than 800W.
     
     


    Yeah, a lot of those numbers look pretty high.
    #18
    Cool GTX
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    Re: PSU Requirements 2020/09/30 10:53:21 (permalink)
    If you want to play the "what if game" - this is the best power calculator I've found OuterVision Power Supply Calculator
     
    CPU watts is the biggest variable depending on your hardware & OC settings

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    AnonymousGuy
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    Re: PSU Requirements 2020/09/30 11:01:57 (permalink)
    Realistically there's no reason nowadays to have a >1000W power supply unless you're building something so absurd you'd have unlimited budget and buy a 1600W PSU anyways.  Vast majority of builds would "survive" on 550W and be perfectly fine at 650W.  
     
    Components just aren't as hungry as they once were and SLI isn't a thing.  Also NV clamped down on voltage ceilings...back in the 680 Lightning days I was able to get 2 of them to draw 1300W from the wall...f-ing nuts.
     
    Also....older and crappier power supplies may have really low current limited power rails.  Had an XFX / Seasonic one years ago that was 1200? W but if you exceeded 20A on the PCIE plug it would click off.  They lied in the specs about it being single rail.


    #20
    gabolton
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    Re: PSU Requirements 2020/09/30 11:04:57 (permalink)
    Cool GTX
    If you want to play the "what if game" - this is the best power calculator I've found OuterVision Power Supply Calculator
     
    CPU watts is the biggest variable depending on your hardware & OC settings

    Thanks for the link. Looks to be more comprehensive than most I've seen and, if it's correct, my Seasonic 850w PSU shoud be good to go for a 3080.

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    #21
    HeavyHemi
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    Re: PSU Requirements 2020/09/30 11:11:11 (permalink)
    AnonymousGuy
    Realistically there's no reason nowadays to have a >1000W power supply unless you're building something so absurd you'd have unlimited budget and buy a 1600W PSU anyways.  Vast majority of builds would "survive" on 550W and be perfectly fine at 650W.  
     
    Components just aren't as hungry as they once were and SLI isn't a thing.  Also NV clamped down on voltage ceilings...back in the 680 Lightning days I was able to get 2 of them to draw 1300W from the wall...f-ing nuts.
     
    Also....older and crappier power supplies may have really low current limited power rails.  Had an XFX / Seasonic one years ago that was 1200? W but if you exceeded 20A on the PCIE plug it would click off.  They lied in the specs about it being single rail.


    For a single GPU I agree one would not need a KW sized power supply. On the other hand using a 'survivable' level of PSU... not even sure what that is. However, PSUs run most efficient when loaded at ~50% of their rated capacity. There is no practical reason to not take your maximum expected load, double that and call it a day. (if you can't afford the level of PSU you should have, rethink your priorites)

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    #22
    HeavyHemi
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    Re: PSU Requirements 2020/09/30 11:11:50 (permalink)
    gabolton
    Cool GTX
    If you want to play the "what if game" - this is the best power calculator I've found OuterVision Power Supply Calculator
     
    CPU watts is the biggest variable depending on your hardware & OC settings

    Thanks for the link. Looks to be more comprehensive than most I've seen and, if it's correct, my Seasonic 850w PSU shoud be good to go for a 3080.


    Absolutely you should be fine with your PSU.

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    #23
    HeavyHemi
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    Re: PSU Requirements 2020/09/30 11:16:00 (permalink)
    R3L3NTL3SS
    JayManB
    Jacob.jenson6
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.
    https://www.evga.com/power-meter/
    https://seasonic.com/wattage-calculator




    I'm not doubting you but have you actually hooked a kill o watt up to your system to see how much power you're pulling.  I think you would be suprised to see its much less than 800W.
     
     


    Yeah, a lot of those numbers look pretty high.


    Ya think?
    That's 348 watts peak on the GPU.
     

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    #24
    kevinc313
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    Re: PSU Requirements 2020/09/30 11:16:18 (permalink)
    Lots of things work.
     
    Some things work well.
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    AnonymousGuy
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    Re: PSU Requirements 2020/09/30 11:25:39 (permalink)
    HeavyHemi
    AnonymousGuy
    Realistically there's no reason nowadays to have a >1000W power supply unless you're building something so absurd you'd have unlimited budget and buy a 1600W PSU anyways.  Vast majority of builds would "survive" on 550W and be perfectly fine at 650W.  
     
    Components just aren't as hungry as they once were and SLI isn't a thing.  Also NV clamped down on voltage ceilings...back in the 680 Lightning days I was able to get 2 of them to draw 1300W from the wall...f-ing nuts.
     
    Also....older and crappier power supplies may have really low current limited power rails.  Had an XFX / Seasonic one years ago that was 1200? W but if you exceeded 20A on the PCIE plug it would click off.  They lied in the specs about it being single rail.


    For a single GPU I agree one would not need a KW sized power supply. On the other hand using a 'survivable' level of PSU... not even sure what that is. However, PSUs run most efficient when loaded at ~50% of their rated capacity. There is no practical reason to not take your maximum expected load, double that and call it a day. (if you can't afford the level of PSU you should have, rethink your priorites)


    Survivable meaning if you run p95 and furmark together (which is never going to happen in real world anyways outside of a folding machine or heavily trafficked server), it's not going to over-current the PSU.
     
    Practically there's so little price difference between a 550W and a 750W power supply that I'd probably by default get a 650/750W and call it good unless I knew I had plans for top end, heavily overclocked hardware. Maybe upsize if targeting a silent PSU that has some sort of 0rpm fan <50% utilization.


    #26
    HeavyHemi
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    Re: PSU Requirements 2020/09/30 12:09:11 (permalink)
    AnonymousGuy
    HeavyHemi
    AnonymousGuy
    Realistically there's no reason nowadays to have a >1000W power supply unless you're building something so absurd you'd have unlimited budget and buy a 1600W PSU anyways.  Vast majority of builds would "survive" on 550W and be perfectly fine at 650W.  
     
    Components just aren't as hungry as they once were and SLI isn't a thing.  Also NV clamped down on voltage ceilings...back in the 680 Lightning days I was able to get 2 of them to draw 1300W from the wall...f-ing nuts.
     
    Also....older and crappier power supplies may have really low current limited power rails.  Had an XFX / Seasonic one years ago that was 1200? W but if you exceeded 20A on the PCIE plug it would click off.  They lied in the specs about it being single rail.


    For a single GPU I agree one would not need a KW sized power supply. On the other hand using a 'survivable' level of PSU... not even sure what that is. However, PSUs run most efficient when loaded at ~50% of their rated capacity. There is no practical reason to not take your maximum expected load, double that and call it a day. (if you can't afford the level of PSU you should have, rethink your priorites)


    Survivable meaning if you run p95 and furmark together (which is never going to happen in real world anyways outside of a folding machine or heavily trafficked server), it's not going to over-current the PSU.
     
    Practically there's so little price difference between a 550W and a 750W power supply that I'd probably by default get a 650/750W and call it good unless I knew I had plans for top end, heavily overclocked hardware. Maybe upsize if targeting a silent PSU that has some sort of 0rpm fan <50% utilization.


    Or if I was running FS 2020 which even idle downloading updates on the desktop uses some 300 watts or any other modern game using CPU heavily for AI. (they need to fix this) My peak loading is well North of 550 watts just running a demanding game at 4K.
    Edit, finally I'd like to add this should be looked at two different ways IMO, is the question is my current PSU adequate, or is the question, what PSU should I purchase.
    post edited by HeavyHemi - 2020/09/30 12:12:04

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    #27
    gabolton
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    Re: PSU Requirements 2020/09/30 12:30:52 (permalink)
    HeavyHemi
    Edit, finally I'd like to add this should be looked at two different ways IMO, is the question is my current PSU adequate, or is the question, what PSU should I purchase.



    Hmmm .. that'd likely open a can of worms. Adequate is going to vary on what someone intends to do with their system. Personally, I'll spend an hour or so OCing my CPU, less than that on memory and about the same on my GPU. Is that average or below average? Given where we're having this discussion I'd guess it's probably less time than most people here spend on OCing their system so adequate for me may be very, very different than "most" people.
     
    It might be better to just ask what components they have in their system, how old is the PSU and what their goals are for the build.

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    #28
    HeavyHemi
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    Re: PSU Requirements 2020/09/30 14:33:55 (permalink)
    gabolton
    HeavyHemi
    Edit, finally I'd like to add this should be looked at two different ways IMO, is the question is my current PSU adequate, or is the question, what PSU should I purchase.



    Hmmm .. that'd likely open a can of worms. Adequate is going to vary on what someone intends to do with their system. Personally, I'll spend an hour or so OCing my CPU, less than that on memory and about the same on my GPU. Is that average or below average? Given where we're having this discussion I'd guess it's probably less time than most people here spend on OCing their system so adequate for me may be very, very different than "most" people.
     
    It might be better to just ask what components they have in their system, how old is the PSU and what their goals are for the build.




    'It might be better to just ask what components they have in their system, how old is the PSU and what their goals are for the build.'

    Well of course, we would not know the answer to my point without the basics. I assumed given the context of my question, one would already know this prior to offering suggestions without any basis.
    How do you figure asking the right questions 'opens a can of worms'? I don't get your post at all.




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    #29
    GTXJackBauer
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    Re: PSU Requirements 2020/10/01 10:26:56 (permalink)
    JayManB
    Jacob.jenson6
    It really just depends on the rest of your build.
    There's a bunch of power supply configurators out there where you can plug in your components and get a decent idea of where you'll be.
    In my particular use case... I'm running a 3900x on the Aorus x570 Xtreme with 64 gig or Micron B-die *Yes Micron, not the good stuff* @3533 Mhz Cl 16, 18, 18, 36 with 1.38 volts to the rails. (Let's say around 300 watts for the main board, ram, and CPU under heavy load. 330 to be safe.), two fourth gen M.2's (Around 24 watts if both are running at 100%) 3 monitor outputs (negligible consumption) about 12 USB peripherals (Let's say around 40 watts for those three things. That's around 7 watts more than what I need but headroom is a good thing.) two D5 pumps (around 40 watts), 6 140mm Noctuas (about 10 watts total at max) A couple of 120mm fans (about 3 more watts) a large 200mm fan (3 watts).
     
    So let's add all that up.
    330
    +40
    +40
    +10
    +3
    +3
    =426 watts.
    + the GPU... which could be close to 400 watts if I decide to OC the thing and I'm looking at a possible 826 watts

    That means I should probably have a 1000 watt power supply.

    Which is what I have. :)

    It's better to do the math, or at least use something like a configurator.
    https://www.evga.com/power-meter/
    https://seasonic.com/wattage-calculator




    I'm not doubting you but have you actually hooked a kill o watt up to your system to see how much power you're pulling.  I think you would be suprised to see its much less than 800W.
     



    +1 
     
    With all due respect, those numbers are completely off and overkill.  My system is similarly complex, if not more and maxs around 600w, maybe 650w, not always but once in a while dependent on load.  Gaming and folding has me on average 450w-550w.  If I had two GTX 480w (Fermi) running furmark, i'd be sitting around 900-950w.  This isn't the case here.
     
    750w should be more than enough.  Stick with a platnium or titanium rated PSU and Gold if you're on a budget.

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