I used Toms Hardware and the benchmark differences between a 7600GT and 6800GT AGP is decentmaybe 20%. I believe your 6800GS is less powerful than the GT version so there is a decent improvement. Check the marks yourself and see if it's worth it to you.
The 6800gs has the fast ram like a 6800ultra the 6800gt has the slow ram. And I am almost 100% sure Shumway opened his disabled pipes and shaders so in fact he is using the equivalent to a 6800ultra, and he might actually lose performance going to a 7600gt. Or they are very close with in the margin of insignificance.
The 6800gs has the fast ram like a 6800ultra the 6800gt has the slow ram. And I am almost 100% sure Shumway opened his disabled pipes and shaders so in fact he is using the equivalent to a 6800ultra, and he might actually lose performance going to a 7600gt. Or they are very close with in the margin of insignificance.