Inno3D GeForce 6600 GT 128MB
 

There's decent pixel-pushing power that's aided and abetted by
16GB/s memory bandwidth, albeit from a 128-bit memory bus. Sheer card
grunt is augmented with a full set of DX9.0c/OpenGL 1.5 features,
including Shader Model 3.0 and High Dynamic-Range (OpenEXR 64-bit)
rendering, along with the possibility of adding another in SLI mode. Our
benchmarks have shown it to be at least as fast as ATI's X700 variants,
and much, much faster in OpenGL titles such as DOOM 3.

Link:
http://www.hexus.net/content/reviews...lld19JRD05MDg=