Intresting review up by legionhardware. It compares the 8800GTS by Asus to the HD 2900XT by Asus. It complete apples to apples comparison.
http://www.legionhardware.com/document.php?id=645&p=0
Intro
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Interestingly the Radeon HD 2900XT is said to go on sale at just $400 US, making it significantly cheaper than the Ultra and even cheaper than the GTX. So after all is said and done, is the Radeon HD 2900XT targeting the 8800 GTX/Ultra or the 8800 GTS? Considering two Radeon HD 2900XT graphics cards can be purchased for a single GeForce 8800 Ultra, this new Radeon must be pretty amazing value. However, this all depends on how the Radeon HD 2900XT stacks up against the GeForce 8800 GTS graphics cards. Today we will be comparing the Radeon HD 2900XT with the GeForce 8800 GTS 320MB and 640MB graphics cards.
X3 Reunion
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X3: Reunion was the first game we used to test the new Radeon HD 2900XT and before the performance testing began, this game was also used to first stress test this graphics card. We noticed during the stress testing that the frame rates were quite high and the game played extremely smoothly at 1920x1200. Amazingly the game was reporting a frame rate of 109fps, making the Radeon HD 2900XT around 60% faster than the 8800 GTS graphics cards. Perhaps more extraordinary is the fact that the Radeon HD 2900XT is more than 10fps faster than the GeForce 8800 Ultra in this game (though we didn’t show these results).
Company of heros
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While not as impressive in Company of Heroes, the Radeon HD 2900XT is still able to outperform the GeForce 8800 GTS graphics cards. At 1920x1200 the Radeon HD 2900XT was 10% faster than the 640MB version of the 8800 GTS, while it defeated the 320MB version by 30%, which is an impressive win. For a $400 US graphics card the Radeon HD 2900XT performance in Company of Heroes is impressive, though it's noticeably slower than the 8800 GTX.
FarCry
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The Radeon HD 2900XT was even faster in Far Cry, defeating the 8800 GTS 640MB graphics card by 8% and the 320MB card by 11%. Although all three graphics cards produced well over 100fps at 1920x1200, it is nice to see the Radeon HD 2900XT maintaining its commanding lead over the 8800 GTS graphics cards.
FEAR
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We thought F.E.A.R might be the undoing of the Radeon HD 2900XT, but based on these results it is safe to say the new Radeon can deliver acceptable performance in this game. At 1920x1200 the Radeon HD 2900XT was just 4% faster than the 640MB 8800 GTS, while it crushed the 320MB version by 41%. Again another good result for the Radeon HD 2900XT in F.E.A.R!
Before I get accused of cherry picking, Supreme Commander
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Well it wasn’t F.E.A.R that brought down the Radeon HD 2900XT and ended its winning streak, rather it was the action packed RTS (Real-Time Strategy) game Supreme Commander. At 1920x1200 the Radeon HD 2900XT was 9% slower than the 320MB 8800 GTS, while it was 14% slower than the 640MB version. Quite an unexpected and somewhat disappointing result for the Radeon HD 2900XT in Supreme Commander.
Prey
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Well it wasn’t F.E.A.R that brought down the Radeon HD 2900XT and ended its winning streak, rather it was the action packed RTS (Real-Time Strategy) game Supreme Commander. At 1920x1200 the Radeon HD 2900XT was 9% slower than the 320MB 8800 GTS, while it was 14% slower than the 640MB version. Quite an unexpected and somewhat disappointing result for the Radeon HD 2900XT in Supreme Commander.
STALKER
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The Radeon HD 2900XT looked to be on fire once again as we completed our 1280x1024 testing, we could hardly believe a frame rate of 146fps! However as the resolution was increased the frame rates rapidly decreased and by the time we hit 1920x1200 the Radeon HD 2900XT was just 12% faster than the 640MB 8800 GTS. The Radeon HD 2900XT was 77% faster than the 320MB 8800 GTS!
Impressive results least to say, however, I'm sure the gaps would be closed up with some AA/AF.
*Taken from rage3d*