5 boxing.

[-silencer-]

I'm currectly quadboxing. 3 wow's on my main pc and 1 wow on a 7 year old pc. Now i'd like to go for 5 boxing, but before that i need to upgrade my PC or buy a second one to run 2 or 3 slaves on.

My main pc's specs:
GigaByte GA-P35-DS3R, P35 (ATX, Sound, LAN, SATA II, RAID)
Intel Core 2 Duo E6850 (S775, 2x3,00GHz, 4MB, 1333MHz FSB, Boxed
Corsair 2GB DDR2 (2x1GB) PC6400 800Mhz CL4 (TWIN2X2048-6400C4) (bought another 2x 1g DDR ram)
NVIDIA GeForce 8800 GT xfx 512 mb

Get a SSD to have much faster access to data resources, and get 4GB of ram. That PC *can* 5-box, as I 5-boxed for a year on this machine:
E6600, 4GB RAM (only WinXP 32-bit though), RAID0 2x 36GB Raptors, 8800GTX.
Now, a 5-boxing machine can be done cheap.. just upgrade that E6850 to a Q6600 (make sure your motherboard supports it though), get 8GB of RAM, get 64-bit Windows, an SSD (even a cheap $100 will be better than any HD for hosting WoW), and a newer videocard.