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Your core isnt running @ 491 mhz. Thats only the vertex engine. The 7800GTX has seperate clock domains for its rops/shader units/vertex engine. Thats just how rivatuner reports it.
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|CPU: Intel Q6600 Quad Core @ 3.2 Ghz|Mobo:EVGA Nforce 780I @ 1470 FSB|Memory:4 Gig Corsair XMS2 DDR1066|Video:Geforce GTX 260x3 SLIMonitor:1680x1050\/Olevia 27 Inch Widescreen HDTV 1920x1080
|CPU: AMD Phenom 9600 Black Edition @ 2.5 Ghz|Mobo:Asus M3n HT Deluxe Nforce 780A|Memory: 2 Gigs Corsair Dominator @ 1066| Video: Geforce GTX 280x2 SLI
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