The RX2600XT has a pretty good showing in Splinter Cell: it edges out the XFX 8600 GT at the higher resolutions when AA is not engaged. The RX2600XT compares fairly well to the more expensive 8600 GTS -- about where you'd expect to be, considering the card's price is halfway between the XFX 8600 GT and XFX 8600 GTS.
However, you may have noticed that the similarly priced EAX 1950 Pro delivers about TWICE the FPS as the RX2600XT with AA enabled. Twice the performance at the same price point is enough for a double-take.