Does it make much sense to build a dedicated GPU rig at this point in time? I calculated a simple payoff of 5 months (which sounds good) for a rig that I'd build, but with BTC difficulty increasing at 10%/week it looks like it might never pay itself off.
Thoughts?
Also while I am posting, is a 650W gold PS enough to power a rig with 2 7950's? (my current 7950 appears to draw ~200W). I think the extra 200W should be enough to power the rest of the PC components...
Yes I have 2 rigs exactly like this. 650W + 2 x Sapphire 7950s but no hard drive just USB boot. Powertune at +20 and they are very, stable each rig doing 1250 kh/s for LTC mining. Should be even less power draw for BTC mining.