01-24-2016, 11:49 PM
Hmm... It's interesting you'd have this problem with Nvidia GPUs. When I first started reading, I thought for sure you'd say you were running 6990s or 290Xs or something.
GPUs do tend to have a bad habit of drawing > 75W through the PCI-e slot, that's why gaming motherboards typically have the molex/sata power connector by the PCI-e slots to provide them with supplemental power. And before that, EVGA had a little card that you plug into a free PCI-e slot to provide additional power.
But this makes no sense with GTX 980s. You'd have to be drawing > 225W each for them to want to draw more than 75W through the PCI-e slots, and I don't think it's physically possible for the card to draw that much power. Unless you have OEM design cards that are designed poorly and thus are drawing most of their power from the PCI-e slot instead of from the PCI-e cables... So I guess I should ask, are these reference design or OEM design cards?
GPUs do tend to have a bad habit of drawing > 75W through the PCI-e slot, that's why gaming motherboards typically have the molex/sata power connector by the PCI-e slots to provide them with supplemental power. And before that, EVGA had a little card that you plug into a free PCI-e slot to provide additional power.
But this makes no sense with GTX 980s. You'd have to be drawing > 225W each for them to want to draw more than 75W through the PCI-e slots, and I don't think it's physically possible for the card to draw that much power. Unless you have OEM design cards that are designed poorly and thus are drawing most of their power from the PCI-e slot instead of from the PCI-e cables... So I guess I should ask, are these reference design or OEM design cards?