Regarding Graphics Cards I would like to add:
Even the highest DX10 card of 2011 is hardly sufficient to play the game at the highest settings. So, be prepared to live with compromises waiting for the next or the after next generation of GPUs...
SLI (and I suppose Crossfire as well) does not really work (so do not hope that a second GPU will give you the performance you are missing with your 2011 or older GPU). As far SLI is concerned, the game officialy (JAN2012) does not support it, you can make SLI work but the performance (on my GTX570 1.3Gb VRAM) has more fps but more stutter so I can not recommend sli to anyone.
According to some people who tested it with their 3Gb graphics cards, the game requires 2,4Gb VRAM with the highest settings.
Therefore what you need is a card with at least 2,5Gb VRAM if you want to see all "eye candy". Again, you may still be dissapointed with the performance but at least, VRAM will not be the factor that destroys your experience.
In worst case, go for a card with min 2Gb if you want to buy a card with the least money now.
The new generation of ATI cards is out now. I have no experience about it so it is good to keep your eays and ears open for reviews on this card and hopefully we will have CoD users soon to share their impressions with us!
~S~
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