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Helpful Reply780 Ti Classified / PSU wondering.

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ganzosrevenge
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2014/09/21 06:31:12 (permalink)
I have a 780 TI Classified, and I have a Seasonic 1050w Platinum XP3 PSU incoming tomorrow.  I've noticed on many modular PCI-E cables, that you plug in one PCI-E 8-pin into the power supply, and then two 8-pin PCI-E connectors are available for the video card.  (For this I will call it 1:2).  If I were to plug in 2 8-pin PCI-E connectors into the PSU (which would give me 4 PCI-E connectors hanging out at the GPU's end), and take one PCI-E connector from each of those cables (for 2:2), tie back the remaining PCI-E connectors... would this work?  (ie: if i have PCI-E cable 1, which yields connector 1a and 1b; and PCI-E cable 2, which yields 2a and 2b... and used cables 1a and 2b for the GPU, then tied back 1b and 2a as "extra connectors.)
 
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Jason

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    bdary
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 06:36:35 (permalink)
    You could do that, but why would you want the extra cable there when it's not needed?  Just curious.


     
     
     
     
     
     
     
     
     
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    ganzosrevenge
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 06:41:28 (permalink)
    Would it allow for cleaner power to be delivered snce the pwoer is travelling along 2 sets of wires rather than 1

    DESKTOP: CORSAIR OBSIDIAN 350D | ASUS MAXIMUS VII GENE | Intel Core i7-4790K @ 4.4GHz | 32GB Corsair Vengeance Pro DDR3-2400 11-13-13-31 RAM | EVGA GTX 1080 CLASSIFIED - 8GB GDDR5X RAM (2,560 Cores / 256-Bit) Driver: 368.81| 256GB Samsung 850 Pro SSD | Seasonic SS-1050 XP3 | Dell UP2414Q 4K IPS Monitor| Swiftech H220-x Liquid Loop | Win10 Build 14901
     
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    bdary
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 07:22:07 (permalink)
    I can't answer that with 100% certainty, but since the PSU was designed for a single PCIe cable to supply two power connectors on a GPU, in my opinion I doubt it would make any difference.


     
     
     
     
     
     
     
     
     
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    HeavyHemi
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 09:12:12 (permalink) ☄ Helpfulby ganzosrevenge 2014/09/21 12:33:13
    ganzosrevenge
    Would it allow for cleaner power to be delivered snce the pwoer is travelling along 2 sets of wires rather than 1


    Cleaner power? No. The design is a single rail. Meaning each output that you plug into is from the same source electrically. The only possible tangible difference might be under extreme overclocking where you might have fraction of a volt less voltage drop using two separate cables to the GPU versus one. Basically the same concept as using a heavier gauge wire which can carry more current. Other than that, there's no difference at all.

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    ganzosrevenge
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 12:34:00 (permalink)
    HeavyHemi
    ganzosrevenge
    Would it allow for cleaner power to be delivered snce the pwoer is travelling along 2 sets of wires rather than 1


    Cleaner power? No. The design is a single rail. Meaning each output that you plug into is from the same source electrically. The only possible tangible difference might be under extreme overclocking where you might have fraction of a volt less voltage drop using two separate cables to the GPU versus one. Basically the same concept as using a heavier gauge wire which can carry more current. Other than that, there's no difference at all.




    I noticed that my voltage would drop to 11.80v with the 780 Ti Classy when I had it at 1098 / 1163 using an RM850.  That's why I asked if my idea would help me keep the voltage closer to 12v.

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    HeavyHemi
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 13:55:00 (permalink) ☄ Helpfulby ganzosrevenge 2014/09/21 14:07:55
    ganzosrevenge
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    ganzosrevenge
    Would it allow for cleaner power to be delivered snce the pwoer is travelling along 2 sets of wires rather than 1


    Cleaner power? No. The design is a single rail. Meaning each output that you plug into is from the same source electrically. The only possible tangible difference might be under extreme overclocking where you might have fraction of a volt less voltage drop using two separate cables to the GPU versus one. Basically the same concept as using a heavier gauge wire which can carry more current. Other than that, there's no difference at all.




    I noticed that my voltage would drop to 11.80v with the 780 Ti Classy when I had it at 1098 / 1163 using an RM850.  That's why I asked if my idea would help me keep the voltage closer to 12v.



    That depends upon where you measured the voltage at. If your PSU was dropping to 11.8v under load as measured at a it's output (which is in spec of +- 5%), using different cables to the GPU isn't going to change that voltage.  If however, you are measuring a voltage drop under load at the end of the GPU PCIe cable compared to what it is at the plug on the PSU, then you might try a different cable or two separate ones. At normal over clocking levels I don't see that happening with a quality PSU.

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    ganzosrevenge
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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 13:59:28 (permalink)
    It comes up in GPU-Z as 11.8v

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    Re: 780 Ti Classified / PSU wondering. 2014/09/21 15:12:01 (permalink)
    ganzosrevenge
    It comes up in GPU-Z as 11.8v


    Okay, but that doesn't tell you if the drop is at the PSU or because of the cable. You need to physically measure the voltages using a digital multimeter. I doubt, unless the PCIe cable is defective, you're going to see any difference.  You need to measure idle voltages then voltages under load both at the PSU and then at the GPU end of the cable. Software voltage reporting isn't that accurate. You'll likely see about the same voltage drop for the +12v system voltage going to the motherboard while the system is under load. You can use AIDA64 for example, to check system voltages at idle and under load. As I said earlier, they a just a close approximation and not as accurate as using a decent digital volt meter.

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