Overall Performance
The new GeForce 8800 GTS 512MB is an interesting performance beast. On the one hand it has very high shader performance, faster than an 8800 Ultra, but it also has a narrower memory bus-width and less local video memory than a GTX. A little tidbit of info you may find interesting using 3DMark06’s pixel shader test, the BFGTech 8800 GTS OC 512MB scored 557 FPS in this test, and the GTX scored 489 FPS.
This creates the kind of performance scenario where in some situations the new GTS may be faster than a GeForce 8800 GTX (where memory bandwidth isn’t the limitation, but shader performance is), but in other situations the GeForce 8800 GTX will still be faster. We noted that most of the time, at higher resolutions with AA the GeForce 8800 GTX shone through with smoother and higher performance, which makes sense.
Display Matters
If you are gaming on a large 30” LCD at 2560x1600 the GeForce 8800 GTX is still going to be the preferred video card for gaming. Its larger framebuffer capacity and higher memory bandwidth will provide benefits at that resolution in your games. If, however, you are gaming on a 24” display or smaller, the choice now becomes a bit hazier.
At 1920x1200 we found the new BFGTech GeForce 8800 GTS OC 512MB to be very capable, providing high performance right on the heels of the GTX. If you already have a GTX or better you are well off as they are still the fastest cards around besides the Ultra. If you are looking for a new high-end video card this holiday season, the new GTS is certainly a worthy option, just don't expect high levels of AA at upper end resolutions with the 8800 GTS 512MB.