Ive talked to a few people about why WoW in windowed mode chews up so much CPU when I get to running multipal instances. Best explanation ive been given so far is the directX overlay. OK....

Its not the GPU. Ive hooked up seperate monitors to this box off each video card and it made no difference to the performance to have 3 instances on one card and the other 2 on another, or all 5 on one and enable SLI/disable SLI. Also to note. If the instances are running with low ingame settings (4 drones are at the lowest setting, main account is pegged out) or higher settings, it did not seem to affect each instances frame rate. Just the ammount of ram each instance chewed up. WoW just doesnt take up much GPU resources.

It would be very nice to get all 5 accounts on one box. With 4 boxes in one room, it gets hot and costs about the same each month in power to run the setup and AC as does account fees. I know my power bill would get cut in half if I could manage. We have cheap hydro power here so I dont have the scary $400 power bills like Xzin, but $120 is steep when before multi-boxing it was around $45.