The Radeon X1650 XT isn’t much slower than the GeForce 7600 GT in this OpenGL application, but these are purely theoretical data. If you try to play Prey on either of these cards, you’ll have to lower the level of detail or switch into a resolution lower than 1280x1024, or perhaps do both things at once.
Serious Sam 2
The Radeon X1650 XT has the same speed as the GeForce 7600 GT here: the AMD solution compensates its fewer TMUs (8 against 12) with its pixel processors (24 against 12).
But when it comes to practical gaming, it’s only the Radeon X1950 Pro of all the participating graphics cards that ensures a comfortable gameplay. It delivers an average frame rate of 45fps and a min speed of 25fps.