Doom 3 is a good system test, it heavily stresses the stencil fill rate of the video card through the unifed lighting model, it will also be interesting to see just how much of a difference doubling memory and overclocking will alter the frame rate.

We use a custom timedemo for Doom3 and take results across three levels and approximately 10 minutes of in-game time, all results are averages of three runs to eliminate any abnormalities that may occur.

With Doom3 maxxed out and on ultra setting it certainly is a test of the system, with the Nvidia 7800GTX aiding the very respectible frame rates even with eye candy. It is clear adding another 1 gig of ram helps with frame rate as does overclocking, but not in an overly dramatic manner.