Yeah, from my experience the CPU is the bottleneck for multiboxing, since the WoW graphics engines are sufficiently old to run with no sweat on up-to-date video hardware. My E6600 (dual core) with 4G runs 3 clients fine with plenty of free memory and graphics card relatively cool, but the CPU gets pinned often. 4 clients turns it into a bad experience, and 5 clients is unplayable. I can turn the 3 clients video settings up without any effect, though. Looking forward to getting my i7...
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