Mainstream and Entry-Level Graphics Cards
Even entry level graphics cards achieve sufficient performance numbers in the 1024x768 resolutions, which is something that developers deserve a credit for. In 1280x1024 only two graphics cards manage to surpass the barrier: the GeForce 6600 GT and the RADEON X800 GT.
Quite naturally, the highest performing graphics cards lead with eye candy enabled. The RADEON X800 GT is noticeably faster than the GeForce 6600 GT due to 256-bit memory bus. The rest of the competitors hit about 45 – 47fps only.
To sum it up, if you are looking for a very affordable graphics card to play the Quake 4 game, you should look forward the RADEON X800 GT.