GPU question for WoW 10-15boxes

[MiRai]

The only other thing that I considered when I thought about buying a Titan was that it uses considerably less +12v power than the 780. (I solved that issue by buying a 1200w power supply. )

A lot of people way overestimate how much wattage they really need in their system. Having a large PSU isn't necessarily bad, but if you're not operating near capacity (80-90%) you normally get less efficiency out of it than if you weren't.

The stock GTX 780, 780Ti, and Titan all require a single 600W PSU according to nVidia's site -- That wattage is system-wide. You can probably add < 200W per card in addition to that (for SLI), because my power hungry system that has 3x GTX 580s in SLI uses < 900W while benchmarking them in Unigine Valley (and they're definitely being pushed hard).

I've never bothered to check the power usage while multiboxing, but the scene changes so often, causing the machine's load to fluctuate so much, that I doubt it sits above 900W for very long.

EDIT: Actually here's a really good chart showing system-wide power usage from this review. Their 3-way GTX 580 numbers seem a little low. Maybe I'll have to test mine again.