The 65nm version is actually a rebranded GeForce 8800 GT based on G92 core while the 55nm version is actually G92b core we have told you before. Both will be higher clocked than the 8800 GT.
The reason is that Nvidia is not comfortable to go full fledge 55nm process like AMD so the 65nm version is more of a safety precaution just in case the yield from 55nm doesn't turn out well.
GeForce 9800 GT to go 55nm and 65nm
Posted on Wednesday, April 30 2008 @ 19:22 CEST by Thomas De Maesschalck