Note that all the requirements we list here are for multiboxing 5 copy's of World of Warcraft with WoTLK exp installed. They are also only recommended requirements and should only be used as a rough guide.

For an example I currently run the following setup:

Apart from the ram and monitor its all pretty old gear now and can be brought for cheap. I can easily run 5 copy's of World of Warcraft and walk around dalaran with 50+ FPS on the main window and little to zero lag. I can also run fraps to record while running 5 copies of the games without any problems.

Using my setup as a rough guide for your multiboxing setup you could assume its safe to say you could use:

Any decent Quad/Dual Core CPU around 2-3GHz - Go for i7 CPUs if you want the best.

Always try to buy the best Hard Drive but anything 100+ GB with 7500RPM will do the job.

RAM - If running 4-5 copies of WoW with the WoTLK expansion installed you really want to try and have 2GB per copy of the game running. Although, I have ran 5 copies on 4GB it was with every setting down on ultra low and it is definitely doable.

My GPU is a few years old now but anything you can get for £150+ ($300)+ will do the job.

Monitor ideally wants to be 20" or bigger or get 2 monitors and run the main character and the others on a separate.