DOOM 3 on a Dual 2.5 G5

We started testing DOOM 3 on Apple's current highest end configuration available on the Store. It's a Dual 2.5 GHz G5 with a Geforce 6800 Ultra, that has 4 Go RAM and is connected to a 30" Apple display.
We first made tests in medium and high quality, using various resolutions without AntiAliasing and all other options being activated.

We then tried and tested the overall effect of AntiAliasing on performances.

The 1280x800 and 2560x1600 resolutions, that are specific to the 30" in full screen can be selected by pressing the Apple key when launching the game.
To understand and comment the results displayed here in FPS took us more time than conducting the tests. Here are our conclusions:
- Obviously, and whatever way you put it, there is something wrong with this game. Performances are almost constant up to1280x800 , which accounts for the fact that there's something in the machine, before the video card, that would stall and bridle performances. On the fastest Mac now available :(
- From 1600x1200, you'll reach the limits of the card, 2560 x1600 being virtually unplayable.
Antialiasing, though it will strongly improve the image quality, has no effect when used at the lower resolutions. It's the Geforce itself then that will do a part of the calculations, and you feel that it doesn't
break a sweat in doing so. Note that deactivating the "Shadow" option will earn you about 20% more FPS under any resolution.
Some will find us tough, but this game is probably the worst thing that could happen to Apple in such a successful period. Unless playing in lower resolutions, and be satisfied with it and images of lower
quality that Duke Nukem would already offer so long ago, this game is merely unplayable on most currently sold machines. Unless Apple would do a big hop to the most recent video card generation when they renew their iMac (a 6600 or a X700 at least), Doom 3 will result in more frustration than happiness, unless the industry, in an unlikely move, turns back to games in text mode, as we used to have on Sinclair computers.
Apple made so many great things to bestow the Mac a more modern image: the G5, the iPod, the iMac, the Mac mini, all participated in making people want to own an Apple branded machine again. Now the Anti-Mac will dash to this leak and claim our machines are underpowered. It may not be that simple, and we know it well, but a single poor argument will dissuade more than a would be switcher.