Neoseeker has published a review of Sapphire's midrange X1800GTO

Ultimately what will win people to the X1800 GTO is its stellar performance with AA and AF on, and its slightly more advanced feature set (Avivo, HDR+AA namely) in comparison to what NVIDIA offers. While the Sapphire card does not have the unlockable pipes that some brands are reported to have, it offers great framerates regardless in most games. It beats the 7600 GT in most games, although the 7600 wins in Half Life 2 and FEAR and Doom when there is no filtering. Once filtering is turned on however, the X1800 GTO trumps or matches the 7600 GT in almost any case.

Sapphire X1800GTO Review