Oh no. It only has the same chipset. Well, its a AGP. The 6800 is being sold on Newegg.com for $189 wo/ shipping. The 6600GT is being sold on the same site for $145 wo/ shipping.
One last thing I just noticed. The Core Clock of the 6800 is 325 MHz, while the 6600GT has a 500 MHz core clock. Thats quite a difference and I would personally like to recommend the 6600GT
This is the 6600GT from Newegg.com.
I know its PNY and is only rated 4 stars, but I love the one I have.
The eVGA one has like 177 reviews and is rated 5 stars. You have to deal with a $15 mail-in-rebate though. If you want, I can like you to the eVGA one also.
EDIT: If you're still interested in the 6800, I could link you to that also.