In our 512MB Radeon X800 XL review we ran several Doom 3 tests because id Software have long since spoken of Doom 3's "Ultra" mode requiring more than 500MB of video memory to operate effectively. However, our first look at a 512MB board we could see very little performance difference between a 256MB and 512MB board with either our own Doom 3: Resurrection of Evil test or the standard, pre-supplied demo1 test in Doom 3. We've queried this with id, asking how our performance numbers reconciles with their comments on the Ultra mode's memory requirements and id Programmer Brian Harris replied with the following: