when i first started multiboxing i was running vista 32-bit with an 8800gtx and 4gb of ram installed, dual-core e6600. i upgraded to a quad-care q9550 and gtx 280 but still used vista 32, and honestly performance SUCKED. the gtx 280 ate 1gb of my system memory, leaving 3gb for the OS and 5 instances of wow. upgraded to vista 64 at the same time i got another 4gb of memory, bringing me to 8gb total. wow uses 5-6gb total when i'm multiboxing.