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3080ti FTW3 with 2 PCIE power cables

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al2jzge
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2021/10/23 11:14:41 (permalink)
I’ve got an EVGA 3080 ti FTW3 ultra and a Corsair rm750x that only has 2 PCIE 8 pin power cables. Each PCIE cable comes with 6+2 pin pigtails attached. Using both PCIE cables, can I also use one of the 6+2 pigtails for the 3rd 8pin on the 3080ti FTW3?

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    Derren001
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 11:35:55 (permalink)
    No, 1 cable per plug. 
    post edited by Derren001 - 2021/10/23 11:37:47

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    #2
    kraade
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 11:42:46 (permalink)
    I would get an 850w psu min with this card and run 3 cables 
    EVGA has a good sale going this weekend


    #3
    al2jzge
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 11:49:46 (permalink)
    Thanks for the feedback. Yeah, I may just get an 850w PSU.

    I used the EVGA Power-Meter tool and it recommends 750w PSUs. And one is the EVGA SuperNOVA 750 GT that only has 2 VGA plugs on the PSU (same as Corsair rm750x). So the EVGA’s own tool is wrong?

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    #4
    CraptacularOne
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 12:00:09 (permalink)
    You should be able to run it by using the split cable in PCIe #3 (8 pin closest to the end of the card) just don't really try to overclock it. The Corsair PSU you have is a good unit and should be able to cope with it but I would advise a higher spec PSU in the near future. 

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    #5
    kraade
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 12:00:50 (permalink)
    al2jzge
    Thanks for the feedback. Yeah, I may just get an 850w PSU.

    I used the EVGA Power-Meter tool and it recommends 750w PSUs. And one is the EVGA SuperNOVA 750 GT that only has 2 VGA plugs on the PSU (same as Corsair rm750x). So the EVGA’s own tool is wrong?

    No it will run it but and you can even test it out with the pig tail and it should run. Its the power draw that is going to heat the pig tail because its pulling to many amps than a pig tail is rated for, A 750 is really on the edge and if you are running an undervolt its probably ok but some titles will have higher than intended power draw spike which can trigger the over current protection in some PSUs. (which your system will reboot). I had this in MSFS with a 750 and a 3080 FTW3, soon as the aircraft launched it would reboot. 


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    ObscureEmpyre
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 13:22:23 (permalink)
    Just throwing this out there. I’ve got a 9700K paired with a 3080 Ti FTW3, and they’re powered by a 750W 80+ platinum PSU. Haven’t had any issues. I’ve also got a 9900K that’s also paired with a 3080 Ti FTW3 that are powered by 1000W 80+ titanium PSU. Something I’m considering, however, is the fact that Alder Lake CPUs are quite power-hungry. The 12900K is reportedly drawing upwards of 330W under heavy load. With that in mind, it’s giving me pause about even my 1000W PSU given that my GPU can easily pull close to its 450W rating. AMD CPUs don’t seem to be as thirsty for juice, so that may factor in depending on what platform you’re currently using and with regard to future upgrades. If there’s one thing that’s somewhat future-proof because they last, it’s a PSU. So, make sure you choose one with plenty of headroom when it comes to power.

    When it comes to powering your GPU, I’d run 3 separate PCI-E power cables to it if I were you. Like kraade said, you’ll be pulling more amps through a pigtailed power connector. Any licensed electrician will tell you why it’s a bad idea to use a 20A circuit breaker when the wiring is rated for 15A. The same principal applies to the wiring of your PCI-E power cables. A pigtailed cable will run rather hot and that could cause problems or failure over time.


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    talon951
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 14:12:23 (permalink)
    It'll be fine. The Corsair RM series comes with 16 gauge PCIE cables,

    https://www.tomshardware....21-power-supply-review

    I have an RM850x that holds up to 550w from the Galax 1kw bios on my FTW3. I do have 3 cables run of course for that.

    Just connect the 2 outer plugs together with the 2nd cable on the center connector that runs the hottest.
    #8
    neteng101
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 16:50:03 (permalink)
    Run 1 and 3 on the same cable for now, keep 2 (middle) on the single cable, get a better PSU and don't overclock/increase power limit for now.
    #9
    kevinc313
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 17:32:42 (permalink)
    talon951
    It'll be fine. The Corsair RM series comes with 16 gauge PCIE cables,

    https://www.tomshardware....21-power-supply-review

    I have an RM850x that holds up to 550w from the Galax 1kw bios on my FTW3. I do have 3 cables run of course for that.

    Just connect the 2 outer plugs together with the 2nd cable on the center connector that runs the hottest.

     
    neteng101
    Run 1 and 3 on the same cable for now, keep 2 (middle) on the single cable, get a better PSU and don't overclock/increase power limit for now.




    3rded.  This is the correct answer.  It will work, until it doesn't.  It will let you know.
    post edited by kevinc313 - 2021/10/23 17:33:43
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    Moonman1969
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 17:57:55 (permalink)
    I bought a rmx 850 last week and its sounds like it has exactly the same setup. 2 PCIE cables each with a pigtail. Luckily I have a 3070ti for now so i can run a separate cable for each, but the idea of having almost 300 watts from a single connection sounded a little much.
     
    My ancient AX850 from 2011 had 4 separate 8 pins with proper connections. Kind of felt like a downgrade lol
    #11
    kevinc313
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/23 18:21:31 (permalink)
    Monst3r
    I bought a rmx 850 last week and its sounds like it has exactly the same setup. 2 PCIE cables each with a pigtail. Luckily I have a 3070ti for now so i can run a separate cable for each, but the idea of having almost 300 watts from a single connection sounded a little much.
     
    My ancient AX850 from 2011 had 4 separate 8 pins with proper connections. Kind of felt like a downgrade lol




    Should be OK, it has 3 PCIe power cables:
     

     
    But in general 1000w supplies have a much better cable config.
    post edited by kevinc313 - 2021/10/23 18:22:53
    #12
    al2jzge
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 00:39:58 (permalink)
    Thanks everyone. I’m not even going to try using the rm750x for fear of melting something. I ordered a RM850x but 2018 variant that comes with 3 PCIE cables. The new 2021 variant of the same psu comes with only 2 PCIE cables, but it does come with 3 CPU cables! Huh? Lol

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    #13
    Moonman1969
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 01:24:29 (permalink)
    Yeah i was really thrown off by the 3 EPS 8 pins. But yeah good call, might return my Rmx 850 2021 model and get something different as im hoping to eventually step-up to a 3080 as well and while im sure its fine to double up on one, id really rather not.
    #14
    talon951
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 03:24:43 (permalink)
    Well that's just stupid.  Looks like you have to step up to the RM1000x to get 3 cables.  Might be worth it for future proofing when 450w is the reference PL.  lol
    #15
    g_petro
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 06:21:20 (permalink)
    Ampere is very power inefficient.  My 3080TI FTW3 sucks up to 450 wats of power. You need three separate connectors and a powerful power supply to feed the beast. 

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    kevinc313
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 09:04:21 (permalink)
    al2jzge
    I’m not even going to try using the rm750x for fear of melting something.



    You would not melt anything.
    #17
    demon09
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 09:14:43 (permalink)
    talon951
    Well that's just stupid.  Looks like you have to step up to the RM1000x to get 3 cables.  Might be worth it for future proofing when 450w is the reference PL.  lol


    ? my rm 850x has 3 seprate 6+2 pig tail cables so not sure what you mean by stepping up to rm1000x for 3 cables I belive the 1000w has 4 of them 
    #18
    kevinc313
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 09:20:34 (permalink)
    talon951
    Well that's just stupid.  Looks like you have to step up to the RM1000x to get 3 cables.  Might be worth it for future proofing when 450w is the reference PL.  lol


    Monst3r
    Yeah i was really thrown off by the 3 EPS 8 pins. But yeah good call, might return my Rmx 850 2021 model and get something different as im hoping to eventually step-up to a 3080 as well and while im sure its fine to double up on one, id really rather not.



    Yeah return it and write Corsair CS a sternly worded letter.
     
    I looked far and wide for any MB's that support 3x EPS, they are ultra rare.  Granted, you can buy extra Corsair PCIe cables.
     
    demon09
     
    ? my rm 850x has 3 seprate 6+2 pig tail cables so not sure what you mean by stepping up to rm1000x for 3 cables I belive the 1000w has 4 of them 


     
    https://www.tomshardware....21-power-supply-review
     
    I didn't believe it either.
    post edited by kevinc313 - 2021/10/24 09:21:41
    #19
    talon951
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 10:08:42 (permalink)
    I wonder if they would sell you another one? That's crap too IMO, but I do really like Corsairs PSUs. I have the Rm1000x in my 3090 machine. The 16 gauge cables don't even get warm despite putting 200w+ through them with the KP 1kw bios. 8pin voltage sits right at 12v.
    #20
    VegetaCreeper
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 10:43:02 (permalink)
    I have The 1000 G Evga power supply and run 3 separate cables. No issues for me that way

     
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    #21
    kevinc313
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 10:57:31 (permalink)
    talon951
    I wonder if they would sell you another one?



    FYI:
     
    https://www.provantage.co...p-8920111~7CRSC00W.htm
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    demon09
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 11:28:38 (permalink)
    kevinc313
    talon951
    Well that's just stupid.  Looks like you have to step up to the RM1000x to get 3 cables.  Might be worth it for future proofing when 450w is the reference PL.  lol


    Monst3r
    Yeah i was really thrown off by the 3 EPS 8 pins. But yeah good call, might return my Rmx 850 2021 model and get something different as im hoping to eventually step-up to a 3080 as well and while im sure its fine to double up on one, id really rather not.



    Yeah return it and write Corsair CS a sternly worded letter.
     
    I looked far and wide for any MB's that support 3x EPS, they are ultra rare.  Granted, you can buy extra Corsair PCIe cables.
     
    demon09
     
    ? my rm 850x has 3 seprate 6+2 pig tail cables so not sure what you mean by stepping up to rm1000x for 3 cables I belive the 1000w has 4 of them 


     
    https://www.tomshardware....21-power-supply-review
     
    I didn't believe it either.


    ah what the hell the new 2021 rmx 850 is only has 2 pcie 6+2 cables.... but instead has 3 4+4 cpu cables thats an odd change from the older version having 2 cpu 4+4 cables and 3 pcie cables. 
    post edited by demon09 - 2021/10/24 11:30:12
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    al2jzge
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 13:38:34 (permalink)
    Yeah, probably won’t melt. But I probably need more power anyways. Besides the 3080ti ftw3, my rig has a ryzen 5900x, 32Gb 3600 ddr4, dual WD black HDDs, 1 SSD, and sn850 nvme. The extra headroom would be good.

    Gaming: Corsair 760T, EVGA Z97 Classified, Intel i7-4790K, CM Seidon 240M AIO, 2x EVGA GTX 970 SSC (SLI), EVGA GTX 960 SC (PhysX), G.Skill TridentX DDR3 2400Mhz 8GB x4, Samsung 850 EVO 250GB, OCZ ARC100 SSD 250GB x2, WD Black 2TB x2, CM SPH-1050W, Dell S2716DG 27inch 1440p 144Hz G-Sync
     
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    #24
    rjohnson11
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    Re: 3080ti FTW3 with 2 PCIE power cables 2021/10/24 14:09:53 (permalink)
    I always like to have a bit more power myself. When I saw a sale on a Corsair 1000 watt PSU I bought it right away. 

    AMD Ryzen 9 5950X,  Corsair Mp600 Pro M.2, 128GB DDR4  Crosshair VIII Hero, RX 6900 XT Associate Code: H5U80QBH6BH0AXF. I am NOT an employee of EVGA

    #25
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