The GeForce 6600 GT-based card performs as expected in this test: in 640x480 resolution, i.e. when the results are least limited by the memory bus bandwidth, the GeForce 6600 GT is a little faster than half the speed of the GeForce 6800 GT.
When there are eight light sources, the GeForce 6600 GT loses its ground suddenly, even falling behind the RADEON 9800 XT. The problem may lie somewhere in the driver: the commands of the classic T&L are inefficiently translated into equivalent vertex shaders.
The test of processing arrays of sprites loads the vertex processors, but also demands a high memory bandwidth. Once again, the new product from NVIDIA suffers from its narrow 128-bit bus, although clocked at 500 (1000DDR) MHz.