Video ram has no real impact without true x64 game binarys. Most games cant even utilize more than 2gigs of ram on a x64 platform due to not being a real x64 program. If you run a x86 game on x64 it basically stays x86. Then there is the whole mirroring video memory on system ram thing. We are really far from seeing more than 1 gig used effectively, more or less just marketing.
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