7800gs is the agp version of the 7800gt, and it's not as good (16pipelines vs 20 pipelines).
7900gt's are better than 7800gt's, i don't know what they're saying, but i haven't heard much bad things about it.
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Dell Latitude XT Convertible Tablet
Intel Core 2 Duo U7600 1.2ghz CPU
3GB DDR2 677 Memory
120GB 1.8" PATA Hard Drive
ATI Radeon Xpress 1250 Graphics
12.1" WXGA LED Touch Screen
N-Trig Capacitive Touch/Active Digitizer
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