if you would try some OpenCL Benchmarks, like OceanWave it would be fine.
I get not the correct OpenCL result with 10.8 DP1 + Nvidia 9600GT in OceanWave.
Also Luxmark works but not correct results.
For an first test you can use OceanWave:
Nvidia 9600 GT = 89 fps
DL: OceanWave ML (10.8 only!)