I'm using pyopencl 2012.1 with a Radeon HD 6450 with the drivers included in ubuntu 12.04 (fglrx_8.960).
With the attached python script (is a test only), the GPU give me a poor performane (40x slowness) only changing two elements in the vector size...
Time for ASIZE: 29120 [GPU]: 0.296946 s
Time for ASIZE: 29120 [CPU]: 0.354775 s
Time for ASIZE: 29122 [GPU]: 11.4285 s
Time for ASIZE: 29122 [CPU]: 0.429958 s
It's a problem with my graphic card?