Theoretically, RADEON X1600 XT has higher fillrate compared to the RADEON X800 XL, however, in reality it cannot match the latter in high resolutions. This is probably an outcome of only 4 texture mapping units (TMUs) that are present on the model X1600 XT. While framerate is generally not bad even with 1600x1200 resolution, this an alarming sign.
Despite of supposedly sufficient memory bandwidth, the RADEON X1600 XT cannot showcase itself well with FSAA 4x and anisotropic filtering 16x turned on. It offers similar performance with the GeForce 6800 and gives enough speed to play in 1024x768, but it cannot beat the GeForce 6800 GT.
Demo recorded on the Research level utilizes pixel shaders 3.0 in order to optimize performance. ATI’s RADEON X1600 XT scores well, but the only product it can match is the GeForce 6800 that works at significantly lower core clock-speed and provides similar memory bandwidth.
With FSAA and anisotropic filtering the RADEON X1600 XT continues to stay inline with the GeForce 6800 and cannot offer similar performance to the RADEON X800 XL.