Originally Posted by ChrisB17
I want to know if my sig rig PSU is enough to SLI these cards?
Absolutely. It's more than enough!
Guru3D.com was able to get their test system
to pull 567W from the wall when they had two GTX 470s in SLI under full load in this test system (source
). If I assume that their PSU was 85% efficient during this power draw (which is very likely), then that means the system pulled about 480W from the PSU. Guru3D.com also recommends adding 100-150W to account for the rest of the system because these tests are focused on the video cards. So that brings the total to about 630W.
Now, the TX750 is a 750W continuous-rated power supply which means that it has been designed to be able to continuously deliver 750W. So if your system were to pull 630W 24/7, then that would still leave 120W of headroom.
So, I personally guarantee you that you have enough power even for having two GTX 470s in SLI in your system. Even I have enough power for it with my HX650.
I don't care what anyone else says.