Megadeath please show me wear the hell you see a 6600 beat a 6800GT, PLEASE, i beg you. You say you speak from facts, so let's see it. So Doom 3 is just "software" to show off Nvidia ? Then be prepared for more when other games using the Doom 3 engine come out. You are invited to come watch me showcase my Nvidia on this software. Also, are we speaking stock speeds ? I sure hope not b/c most 6800GT's are easily OC'ing to Ultra speeds giving a huge bang for the buck. Yea yea, you Ati peeps get 3DMark05 advantage, congrats. Have fun playing that for 4 hours. HL2 runs better on Ati also but not by much where as Nvidia slaughters Ati in Doom3. Yea, go ahead and tell me I'm a fanboy. Funny thing is I just went from a 9800Pro to a 6800GT. I could care less which I have, I just wont performance. One last thing, enjoy that new Shader Model 3.0 support you don't have after spending all that cash.
Edit: Sorry, you said a 6600GT beats a 6800. Not 6800GT vs. 6600. I highly doubt this due to the 6800 haveing the extra pipes and the 6600GT not. Show me a link and I'll believe.