That's a massive loss in revenue. NVidia's been living off of high end cards even more than ATI has, and it's apparent that people aren't buying them as frequently anymore. WoW is four years old. The other games du jour on the PC at the moment, TF2 and L4D, are also less straining than, say, Crysis. The lack of games pushing that high end (a la Crysis, the single game in the last couple years to really push PC tech) is killing NVidia, imo.
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