How do I buy another power cable or splitter for my Dell 7920?

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matthew.phillips

Dec 20, 2018
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The Dell 7920 comes with 3 power cables (two marked P10 and one marked P12) but I need 4 to power my two gfx cards I'm putting in. So I need either a a) splitter or b) another cable. Regarding b), it actually looks like there's an output for a 4th cable--see last two images here:
https://imgur.com/a/tIlYcYI

But I'm not sure and don't want to do the wrong thing. Can anyone point me to where to get either a splitter or an appropriate second cable? I've spent a lot of time with Dell chat and they were no help.
 
Solution
feelinfroggy777
I would still not use one cable and a splitter for each GPU. Especially for something pulling 300 watts. I agree, the wattage on the PSU wont be the issue. I did not look up the computer and did not know it was a workstation system. But just because it has the wattage for the components does not mean that it will work if it does not have the proper PCIe power cables.

Since you are already gonna drop the cash for 2 2080ti, you might as well get a PSU that can support them. Here is a 1000 watt G3 for $110. It will be less than the tax of the two GPUs. I ran 1080ti SLI on a similar PSU and your GPUs dont push that much more wattage.

PCPartPicker part list: https://pcpartpicker.com/list/VRpzFd
Price breakdown by merchant...
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feelinfroggy777

feelinfroggy777

Glorious
Dec 13, 2016
5,721
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45,990
Most of these prebuilt system PSUs only support the hardware in the machine when you buy it. Adding 2 GPUs will most likely exceed the PSU capacity. I would no get a splitter for the PSU cable as they can only support so much througput. I suggest getting a quality PSU from EVGA, Corsair, or seasonic with the correct cables.

What GPUs are you putting in the machine?
 
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M

matthew.phillips

Dec 20, 2018
4
0
10
Two RTX 2080Ti's, which draw around 290W apiece, max. The PSU is 1400W. I've supported a card that draws ~280W with a 1000W PSU (on different systems) so I think I am good here actually although generally your point is well-taken. I don't have any other power-hungry peripherals except possibly for a third low-wattage gfx card that won't need its own cable. So I want to try to just use the PSU I have, for now.
 
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feelinfroggy777

feelinfroggy777

Glorious
Dec 13, 2016
5,721
135
45,990
I would still not use one cable and a splitter for each GPU. Especially for something pulling 300 watts. I agree, the wattage on the PSU wont be the issue. I did not look up the computer and did not know it was a workstation system. But just because it has the wattage for the components does not mean that it will work if it does not have the proper PCIe power cables.

Since you are already gonna drop the cash for 2 2080ti, you might as well get a PSU that can support them. Here is a 1000 watt G3 for $110. It will be less than the tax of the two GPUs. I ran 1080ti SLI on a similar PSU and your GPUs dont push that much more wattage.

PCPartPicker part list: https://pcpartpicker.com/list/VRpzFd
Price breakdown by merchant: https://pcpartpicker.com/list/VRpzFd/by_merchant/

Power Supply: EVGA - SuperNOVA G3 1000 W 80+ Gold Certified Fully-Modular ATX Power Supply ($109.89 @ OutletPC)
Total: $109.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-12-20 11:09 EST-0500
 
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Solution
feelinfroggy777

feelinfroggy777

Glorious
Dec 13, 2016
5,721
135
45,990
Yes, I am suggesting replacing the PSU all together. You dont want to use both PSUs as they would not fit in the case.

Yes, if you are going to use a splitter that is what I would go with. But remember, that 8 pin cable can only support so much power, when you use the splitter to 2 8 pin cables, you are doubling the power it will be pulling from the single 8 pin cable.
 
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