Hmm... maybe I'm missing something, but I don't see all that much difference between the 7800 and the 7900. Slightly faster core and slightly faster RAM, no more pipelines, no more feature support (although once again, I may have missed something).
The 7900 is 90nm (7800s are 110nm) as well as having higher clocks. Looking at the benchmarks, the 7900GTX is a pretty significant improvement over the 7800GTX 512 for a non-next-gen part.
Predicament
in Hardware
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The 7900 is 90nm (7800s are 110nm) as well as having higher clocks. Looking at the benchmarks, the 7900GTX is a pretty significant improvement over the 7800GTX 512 for a non-next-gen part.