dude heres the deal the 7800gs 16 pipelines its just like a 6800gt ... and all but guess what 6800gt normal is 350/1ghz while the 7800gs is 375/1.2ghz ... the 6800gt can only oc to 400/1.1 normally but the 7800gs can oc to 460/1.35 barely getting hot... its been up to 480/1.4ghz on stock cooling.. i believe that if you were to have a wc set up 7800gs all the way. cuz no doubt it can go to 500/1.5 easily... but other than that its just like jumping a 1 foot wide stream... wow you are so much further than you were befor but if it was say a fx5200 to a 7800gs it would be like 1000000000000000000000 miles from were you started out.. but if you have the cash no doubt buy it by all meens.
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