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dewi said:They're both good cards. Both are very good value for money now and I'm sure you'd be pleased with either. The X1800XT is slightly ahead in DirectX, the 7900GT is slightly ahead in OpenGL. The 7900GT overclocks more, but the X1800XT is faster stock.
I just upgraded from a Geforce4 to an X1800XT 256Mb and I'm very pleased with the card. I get just over 9000 marks in 3DMark05, for what that's worth.