x800gto, 6800xt, 7600gs

cleeve

Illustrious
In the source engine, the X800 can perform HDR, because it is a SM 2.0 compliant method of HDR.

The X800 is also the fastest card of the three.

Avoid the 6800 XT entirely, it's crippled to 8 pipelines. The 7600 GS is good, but the X800 GTO is probably faster. Yes, fast enough for HDR in the source engine. :)
 

cleeve

Illustrious
The only HDR enabled game engine that doesn't require more than SM 2.0 is source, as far as I know.

Far cry - Oblivion - AOE3 - all require SM 3.0 for HDR.
 

Anoobis

Splendid
Feb 4, 2006
3,702
0
22,780
If you want accross the board SM3.0 support, then the 7600GS is the best choice of cards you listed.

The other choice is to look for a used 6800Ultra or 6800GT on eBay.

You should also consider the $180.00 7800GS that GeneticWeapon is selling. That's a decent card for that price.
 

enforcerfx

Distinguished
Jun 4, 2006
1,540
0
19,780
In the source engine, the X800 can perform HDR, because it is a SM 2.0 compliant method of HDR.

The X800 is also the fastest card of the three.

Avoid the 6800 XT entirely, it's crippled to 8 pipelines. The 7600 GS is good, but the X800 GTO is probably faster. Yes, fast enough for HDR in the source engine. :)

Best out of the 3, and the cheapest i believe too. Try www.newegg.com, or ati.com under the clearance section. Both have great deals on them.