6800 vs 6800gt vs x800 vs 9700 pro. Whats the differnce?

[FFactory0x]

Whats the difference with all these cards

 

[GeneralGrievous]

The 6800 GT will about double the 9700 Pro for $400.
The x800 Pro will be around 5-10% behind the GT for the same price.
The 6800 will be around 40% faster than the 9700 Pro for $300.
The 9700 Pro will be around $130 used or $165 new.

 

[TStep]

All the cards you are asking about are in this review.

 

[Matthias99]

also this one -- well, maybe not a 9700Pro, but the regular 9800 performs pretty much identically to it.