If you want to buy this card then probably you should check the price of the new 7950 which replaces the 6950 and is already in the market and, check whether you can find in eBay and good 6950 for sale (as people with 6950s will probably be selling them in order to upgrade).
Your Processor Intel Core2 Duo E8400 is on the low side with only two cores, the game does use four cores. However, overclocked to 3690Mhz it sounds pretty good.
IF you can put a quad core for little money in your existing motherboard, it is worthwhile.
Otherwise you enter a big adventure changing motherboard, RAM, etc etc...
~S~
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