HD2600XT 512 or 7900gt 256???

Ok so heres my questions. In your opinion which card is better? i currently have an xfx 7900gt 256mb factory overclocked 520 core & 1.5ghz memory. It is a fantastic card and all but i have been offered a HD2600XT 512mb GDDR3 card to try and if i like then i can keep. I know that the 7900 has 24piplines apposed 2 that of the 2600, has a smaller bus and it does not quite have the same core and clock speeds as the 7900gt. I'm sure that i read sumwhere that the midrange DX10 cards are similar to the performance of the high end DX9 (7900/x1950) so long as you don't game with AA/AF.
So long story short, is it worth getting the 512mb HD2600xt or stick with the 256mb 7900gt

(p.s apparently the 512mb version of the 2600 is rare so i may only get this opportunity once, will be here at end of month)

Thanks a bunch

If you can keep your 7900, get the 2600 and wait for drivers to improve. I did a similar upgrade path, with a $135 ebay 7900 upgrading to a 2900xt. I had to keep my 7900, bc drivers are total sh!1 right now. Just give them some time.

Yep, keep what you have for now.
But, if you have a situation where you can try it, and give it back if you don't feel it's good upgrade, go ahead and give it try to see what you think.
Be very careful opening the packaging and all, because you will be wanting to return it I am pretty confident.

Keep what you have performance wise a 2600xt regardless of what size memory it comes with is about on a par with a 7600gt tops.
Dont even mess your system about trying it on a free.
Mactronix

Nope, the 8600 are better than the HD2600, but please do not misunderstand what I just said. NEITHER OF THEM ARE ANY GOOD, unless you plan to use the GF8600/HD2600 as frisbees (which is probably the only good use), stay AWAY from these cards.