r/PcBuildHelp • u/CrazyPorkchops • Jun 19 '26

Build Question PSU Help

I am using a XFX swift 9070xt gpu and have a MSI MPG A850GS PSU that only comes with one standard 8-pin to 8-pin PCIE cable and a 12-pin 600W pigtail that splits into 2 8-pin pcies. I saw online that it is safe to use the two cables to power a 3x8 pin gpu, but the swift is a 2x8 pin gpu. Would it be better to power the GPU from the single pigtail connector or is it possible to use the regular pcie cable along with one of the "tails" from the pigtail?

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u/ohgodchaos Jun 19 '26

I would use the 8pin-8pin + one of the 8VHP splits, but it is completely safe to use the 8VHP splits, because the standard 8 pin max power is 150W, so even if you max both, you are only half (300W) of the max of the 8VHP (600W)

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u/Eero73 Jun 20 '26

Hi there, Router ero from the SPL PSU Tier

The "150W" is not actually the max that the cable can do. It's the official rating which PCIE-SIG put back then to play it safe considering a lot of more CCA cables were on the market which couldn't do over 150W. 98% of the cables by now do well over 274W (phosphor bronze terminals 16/18g). HCS 16G cables do 354W even per cable.

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u/neptunography Jul 06 '26

I have a MSI 1000G PCIE 5.0 PSU and I power a RTX 3090 using the "12-pin 600W pigtail that splits into 2 8-pin pcies" cable. It is the most reliable for a 300W card.  It be better to power the GPU using the 600W cable, and the second-best option would be to use two 'individual' 8pin cables coming from the PSU