[SOLVED] Can I add power to PCIe slots by hooking 12v to unused x1 slot?

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Aug 9, 2021
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I currently have a 2080TI and 1080TI on a Gigabyte Aorus x470 motherboard. The mobo doesn't have a supplemental 12V supply to the slots and voltages drop to around 11.6 volts under load (each card pulls about 50W from the slot) with the overall board voltage at 11.9-12V. This has been causing some no BSOD power cycles. I have tried all manner of stress tests without the cards running and nothing triggers (PCIe voltage around 12.1) even running the cards individually (voltage around 11.9). Would I be able to use an unpopulated X1 slot and hook up a 6-pin or Molex through a riser to help give better voltage?

EDIT: I think I found my problem, I was running a -0.1V undervolt on my cpu, after upping it by 0.01V problem seems fixed
 
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Aug 9, 2021
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I've tried cranking the power on the 2080TI and putting it through as much power as possible while stressing CPU (another ~150W) with no issue, it's just when I have both cards running, personally, I'm suspecting Vdroop through board traces, still, thanks for the advice, I'll start looking around for a replacement
 
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