justintoman
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Hi, sorry if this has been asked already. I tried to search for "3090" and "rtx" and "650w" but the search functionality always said nothing found. Anyway, I used the EVGA power meter (I tried linking it here but I guess hyperlinks are disabled) and put in my system specs. ryzen 3900x stock, x570, single ssd, single rtx 3090 (don't have it yet) and it suggested a 650w PSU. As far as I know, I have nearly the beefiest specs possible short of having loads of platter drives or watercooling stuff. 650 seems really low. I already have a 650w PSU and a 2080 super, and when (if) I get my 3090 I was just gonna swap it in place of the 2080. Is the 650 really gonna hold up? It's an EVGA Supernova 650 G5. It seems really low. What builds could possibly demand a 1000w+? Tons of rads and stuff? Again apologies if this has been asked already
post edited by justintoman - 2021/02/24 01:26:35
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z999z3mystorys
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Re: 650w recommended for a build with 3090?
2021/02/24 01:45:08
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I'm not really one to trust the amount that the evga power meter gives you, the card by default recommends a 750w+ PSU, though generally those have a bit of a buffer because they are guessing how much power the rest of the system uses, and they don't know the quality of PSU that you are using. I wouldn't go below a 850w PSU for that card, and certainly not below the 750w
as for what can draw those heavy loads of 1000w+ some systems have more than 1 GPU, or have the CPU and GPU heavily OCed. lots of fans and radiators could also bump those numbers up.
for things like the 1600w PSU they are likely having 3+ cards working, or really want to do extreme OC and need as much power as possible.
Too high of a PSU generally won't cause problems, and PSU tend to be at their highest effiency when they aren't near their max power.
in the end I'd go with at least 850w, more if you really want to push the thing. (there is another factor of transient power spikes that having an extra high wattage PSU might help with, though it might also be a factor of quality of the PSU and how it can handle those, but that's outside of my knowledge area atm, as to what factors are to consider there)
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bob16314
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Re: 650w recommended for a build with 3090?
2021/02/24 01:51:30
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All the EVGA RTX 3090 cards shown here recommend a "Minimum of a 750 Watt power supply" in the Specs..But that's from the NVIDIA Specs that says that's "based on PC configured with an Intel Core i9-10900K processor. A lower power rating may work depending on system configuration". If the EVGA Power Meter says a 650W will do, you can go by that..I would rather go by what the more detailed OuterVision Power Supply Calculator says, though. If you're planning on overclocking the CPU or GPU or adding any new hardware in the future, then you'd be better off getting at least a 750W PSU. Welcome to the forums, by the way..You can't post links yet..Be sure to read the Ultimate Self-Starter Thread For New Members sometime if you haven't yet, lots of good info there for you.
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justintoman
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Re: 650w recommended for a build with 3090?
2021/02/24 04:06:19
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Thanks for the responses!
The OuterVision calculator also recommends 650w (it actually said 630w). I guess I'll try with my 650 initially and if it doesn't work I'll swap to something larger. Is it dangerous to use too low of a PSU? I assume it would just shut off or restart or something. I have a 1000w from my previous build that is a couple years old that should be plenty. That rig is SLI, though, so I was trying to avoid taking its PSU in case I still wanted to use it. Or maybe I should just buy an 850w G5 whenever my notify pops? I guess it's only a couple hundred more. Not sure what I'll do with this extra 650w though.
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bob16314
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Re: 650w recommended for a build with 3090?
2021/02/24 04:29:34
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justintoman
Is it dangerous to use too low of a PSU? I assume it would just shut off or restart or something.
No, and yes.
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Dabadger84
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Re: 650w recommended for a build with 3090?
2021/02/24 04:30:12
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Power Meter is an outdated thing that they need to update, running a 3090 on anything less than a high quality 750W is asking for trouble. Personally I'd recommend an 850W Platinum PSU, as a minimum, to be on the super safe side.
It can be catastrophically dangerous to use an underpowered PSU or a weak unit, especially for something that has the power spikes the 3090s do. There are plenty of people on these forums that have had 3090s or even 3080s randomly result in system shut downs, that were fixed by upgrading their PSUs. A few random shut downs won't hurt your hardware, normally, but if you let it happen too many times it could result in damage, especially if components were running hot before they suddenly get shut down.
I would recommend getting a bigger PSU from the get-go & not taking the risk, but that's my personal preference. I always recommend people go big or go home on their power supplies, better to be on the safe & plentiful side, than skimp on what is essentially the Heart of your system.
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JewsOfHazard
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Re: 650w recommended for a build with 3090?
2021/02/24 23:33:53
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Dabadger84
Power Meter is an outdated thing that they need to update, running a 3090 on anything less than a high quality 750W is asking for trouble. Personally I'd recommend an 850W Platinum PSU, as a minimum, to be on the super safe side.
It can be catastrophically dangerous to use an underpowered PSU or a weak unit, especially for something that has the power spikes the 3090s do. There are plenty of people on these forums that have had 3090s or even 3080s randomly result in system shut downs, that were fixed by upgrading their PSUs. A few random shut downs won't hurt your hardware, normally, but if you let it happen too many times it could result in damage, especially if components were running hot before they suddenly get shut down.
I would recommend getting a bigger PSU from the get-go & not taking the risk, but that's my personal preference. I always recommend people go big or go home on their power supplies, better to be on the safe & plentiful side, than skimp on what is essentially the Heart of your system.
What would you suggest for a 3090 K|NGP|N for someone who intends to overclock, but not necessarily do LN2? Just w/e I can get from the stock cooling.
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tombeaulieu
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Re: 650w recommended for a build with 3090?
2021/02/25 00:29:46
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I do about 8 builds a month. I have gone to 850Watt as my go to for all builds. I've used 3080 3070 3060ti 6800xt 6900xt and found all of them spike in power at somepoint. the only card i'd use any lower would be a 3060ti. normal use they might now need the power but i've seen spikes happen on all of them that maybe can get away with 750 but i'd rather put 850 for people incase they add a bunch of fans, capture cards, tons of HDD never know. Also 6900 and 3090 i'd really recommend 1000 can get away with 850 but i found on the 6900xt when do some serious OC even 850 wasn't enough... now a 3090 i wouldn't trust anything lower than 850... if not overclocking, mining, or doing some type of Nas and streaming combo just running the cards at stock then 850 should work for all of the new cards with the 3060 and 3060ti not needing the power and even with 3070ftw3 i've had spikes that needed more than 750.
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JewsOfHazard
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Re: 650w recommended for a build with 3090?
2021/02/25 00:33:24
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tombeaulieu
I do about 8 builds a month. I have gone to 850Watt as my go to for all builds. I've used 3080 3070 3060ti 6800xt 6900xt and found all of them spike in power at somepoint. the only card i'd use any lower would be a 3060ti. normal use they might now need the power but i've seen spikes happen on all of them that maybe can get away with 750 but i'd rather put 850 for people incase they add a bunch of fans, capture cards, tons of HDD never know. Also 6900 and 3090 i'd really recommend 1000 can get away with 850 but i found on the 6900xt when do some serious OC even 850 wasn't enough... now a 3090 i wouldn't trust anything lower than 850... if not overclocking, mining, or doing some type of Nas and streaming combo just running the cards at stock then 850 should work for all of the new cards with the 3060 and 3060ti not needing the power and even with 3070ftw3 i've had spikes that needed more than 750.
Interesting. I opted to get a P2 1000w Platinum. I've had an 850watt Corsair HX platinum, but also experienced some issues with random restarts using a 5950x and 3080 FTW3, although I hope to get a 3090 K|NGP|N soon.
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castrator86
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Re: 650w recommended for a build with 3090?
2021/02/25 17:50:51
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Dabadger84
It can be catastrophically dangerous to use an underpowered PSU or a weak unit, especially for something that has the power spikes the 3090s do. There are plenty of people on these forums that have had 3090s or even 3080s randomly result in system shut downs, that were fixed by upgrading their PSUs. A few random shut downs won't hurt your hardware, normally, but if you let it happen too many times it could result in damage, especially if components were running hot before they suddenly get shut down.
I would recommend getting a bigger PSU from the get-go & not taking the risk, but that's my personal preference. I always recommend people go big or go home on their power supplies, better to be on the safe & plentiful side, than skimp on what is essentially the Heart of your system.
I'm on a 750W EVGA G1 with a 5900X and a 3080 Suprim. I'm starting to get random shutdowns every now and again. Do NOT skimp on the power supply. Get something that doesn't need to running at maximum efficiency just to power your system.
 
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Dabadger84
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Re: 650w recommended for a build with 3090?
2021/02/25 21:12:22
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JewsOfHazard
Interesting. I opted to get a P2 1000w Platinum. I've had an 850watt Corsair HX platinum, but also experienced some issues with random restarts using a 5950x and 3080 FTW3, although I hope to get a 3090 K|NGP|N soon.
Good choice, you should be very happy with that one. The P2 1000W should be plenty for using the regular AIO cooler on a 3090 & 5950x. Even if you really push both, you're not going to hit the 1000W mark I don't think - the card caps out at around 540W draw if you're really pushing it on the 520W BIOS with some Classified Tool settings, and I don't think that CPU will get anywhere near 500W given how hot it will get by the time it's up to 300+W of draw. Even on the 1000W fully unlocked Kingpin 3090 BIOS, which I don't recommend using for several reasons, you won't actually get to that power draw because thermals will make the card throttle first. I think the most people have gotten up to on a Kingpin when doing sub ambient but non-LN2 cooling, is around 600-650W of draw - I don't think you'll get anywhere near that. castrator86
Dabadger84
It can be catastrophically dangerous to use an underpowered PSU or a weak unit, especially for something that has the power spikes the 3090s do. There are plenty of people on these forums that have had 3090s or even 3080s randomly result in system shut downs, that were fixed by upgrading their PSUs. A few random shut downs won't hurt your hardware, normally, but if you let it happen too many times it could result in damage, especially if components were running hot before they suddenly get shut down.
I would recommend getting a bigger PSU from the get-go & not taking the risk, but that's my personal preference. I always recommend people go big or go home on their power supplies, better to be on the safe & plentiful side, than skimp on what is essentially the Heart of your system.
I'm on a 750W EVGA G1 with a 5900X and a 3080 Suprim. I'm starting to get random shutdowns every now and again. Do NOT skimp on the power supply. Get something that doesn't need to running at maximum efficiency just to power your system.
Exactly, better safe than sketchy.
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Hoggle
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Re: 650w recommended for a build with 3090?
2021/02/25 22:49:44
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I would recommend a better PSU. It might work but I would worry that it might reduce performance and really a PSU is something you can invest in and ten years later be using the same PSU.
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MythicalCultist
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Re: 650w recommended for a build with 3090?
2021/02/26 03:14:51
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650 might be enough to power the system - but keep it sustained during hard, heavy gaming use is laughable.
No way you want to use a psu without having at least a 20% overhead of your needs. you'll get & keep max efficiency by not stressing the unit out at near 100% levels constantly.
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aka_STEVE_b
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Re: 650w recommended for a build with 3090?
2021/02/26 05:07:52
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you can read thru all the pages on here of 3080's & 3090's eating PSU's for lunch. When gaming for extended periods you will be asking alot of your PSU to deliver solid power ( one of the most important functions of a system )
I always recommend getting a few hundred watts above your needs... nothing will stay running well in a long term situation being at it's max stress level. so for a 3090 I couldn't tell anyone to use anything less than a solid brand 850W Titanium/ or Platinum . ( 1000W gold if that's all you can find )
Good luck finding anything right now though. the PSU's are about as hard to get ahold of than a video card....
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Larac
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Re: 650w recommended for a build with 3090?
2021/03/01 10:41:44
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MythicalCultist
650 might be enough to power the system - but keep it sustained during hard, heavy gaming use is laughable.
No way you want to use a psu without having at least a 20% overhead of your needs. you'll get & keep max efficiency by not stressing the unit out at near 100% levels constantly.
Yeah in the olden days it was about 60%. These days being old I still keep max possible use to 70% of rated PSU. Means I have over paid a bit, but also means I know it will not be an issue if I put in a couple of older drives to get stuff off them or to load a drive with data. Would rather overpay for a PSU than damage a unreplaceable Video Card.
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EVGA_Lee
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Re: 650w recommended for a build with 3090?
2021/03/02 15:10:39
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BR to the OP. Looks like we need a bit of updating on the Power Meter. Edit: Back to the OP's question. I wouldn't go below a 750W power supply. With a wattage hungry CPU and GPU, you can easily hit some decent spikes, especially if you're overclocking. If you're sticking with a 750W PSU, then I would go with a flagship PSU, at least Gold rated. If you can find a decent deal on a good-to-excellent 850W unit, I wouldn't turn your nose up at it. Plenty of good power supplies on the market, if/where you can find one.
post edited by EVGATech_LeeM - 2021/03/02 15:14:41
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kevinc313
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Re: 650w recommended for a build with 3090?
2021/03/03 06:28:07
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justintoman
Hi, sorry if this has been asked already. I tried to search for "3090" and "rtx" and "650w" but the search functionality always said nothing found.
Anyway, I used the EVGA power meter (I tried linking it here but I guess hyperlinks are disabled) and put in my system specs. ryzen 3900x stock, x570, single ssd, single rtx 3090 (don't have it yet) and it suggested a 650w PSU. As far as I know, I have nearly the beefiest specs possible short of having loads of platter drives or watercooling stuff. 650 seems really low. I already have a 650w PSU and a 2080 super, and when (if) I get my 3090 I was just gonna swap it in place of the 2080.
Is the 650 really gonna hold up? It's an EVGA Supernova 650 G5. It seems really low. What builds could possibly demand a 1000w+? Tons of rads and stuff?
Again apologies if this has been asked already
Wow I tried it for myself and it spit out 610w, recommended 650w psu. Generally people here would recommend a 1000W Platinum or very high performance Gold for your setup, minimum.
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