http://www.extremetech.com/art.../0,1558,1739664,00.asp
Another review of the same cards for comparison:
<edit> wrong link
6600GT
Despite having only 128MB of memory, AOpen's card managed to trounce the X700 Pro in almost every test.
...
A few games that use a rather large amount of texture RAM, like some massively multiplayer online games, may run into a few performance problems with this 128MB card, but for the most part, it's a lot of bang for the buck.
X700 Pro
Certainly, this card isn't bad. It's not like it's dog-slow, has compatibility problems, or makes more noise than a hair dryer. It has none of those problems, and in fact, the 256MB of RAM provided may prove to be a big benefit in a few games that use a very large amount of textures. But there's really no room for second place in the graphics business, and at the $200 price point, that's exactly what this card is. A GeForce 6600GT simply outperforms it in almost every situation, and sometimes by quite a sizeable margin. It may be good, but we simply can't recommend it when there are such clearly superior competitors.
Another review of the same cards for comparison:
<edit> wrong link
