I have an AMD A8-7600 folding on the GPU portion. It has 6 GPU cores @ 720MHz and generates 8-12K PPD. One downside of loading the GPU is the CPU throttles to 2.4GHz instead of running at 3.1GHz+. Mine is a 65W part and I would be interested to know if this throttling occurs on 95W APUs.
Confirm that the GPU is active on the OpenCL tab of GPU Caps Viewer
. If it is, you should see 3 items in the second drop-down when AMD is selected in the first drop-down. Then post the slot portion of your config and which slot corresponds with the two GPUs you have running already.