I have an XFX 7600GS graphics card. Runs fine, but with the advent of DX10 cards like 8600 series, does it make sense to replace teh 7600GS with 8600GT/8600GS (if at all it exists) ? Will there be any remarkable performance difference? AFAIK 8600 series will not require custom/extra coolers (7600GS runs on stock cooling too). Please enlighten