Are you *always* stoned? Is that it?

The above is exceptionally optimistic; if your cubes run stable on the stock 475Mhz then you're looking at 0.65TH per cube. Most people are able to get 0.7TH per cube by dialing in the clocks and voltages (very simple to do in stock web interface).

The chips run at around 300w each but that's at 0.7v after VRM's which add around 20% inefficiency; so you're going to be pulling around 1800w from your 12v supply. With a half decent PSU you're looking at 1900w at the wall for 3.25TH = 0.58 w/gh or with minimal tweaking 2000w at wall for 3.5TH = 0.57 w/gh.

That's if KfC don't screw you with dead dies that they refuse to RMA and your PCI-e plugs/cables don't melt.

u27