Core2Duo 2.8GHz CPU (really don't want to upgrade this, it'd be a $$$ loss even if I resold it, and it's perfectly good plus I highly doubt CPU is the bottleneck, it isn't pinned when dual-boxing or even single boxing WOW)
+This CPU should be sufficient for 3-boxing just be sure to get rd of useless bloat programs, it by no means is optimal but should be good enough for awhile

4GB single-channel DDR2-800 RAM (board only has two slots, only supports 4gb and single-channel)
+4gb is a little on the low side for multiboxing in general but for 3 boxing it could get you by
* nForce 6-series chipset m/b
a motherboard upgrade with dual-channel ram capability and the option to go to 8gb would greatly enhance your performance, you may not see max memory useage as your bus is saturated with data and your thrashing your harddrive (page filing)

XFX nVidia 9600GSO 768MB PCI-E video
good architecture video card unfortunately its like a v-8 with a governor on it, a lot of horse power with no gas pedal etc. id recommend a 9800gtx or better if nvidia or a 3870+ if ati, keep in mind when you upgrade the video card the cpu can become more of a bottle neck in the system, its easy to balance a system when ya have moneyt o throw at it, btu finding the right balance vs price ratio is definately a challenge.