When I tried to OC my GPU (using mis afterburn), It told me that one of the GPU's usage is at 98%, and the other is at 6%. Also, one GPU is at 70'C, and the other's at 41'C. Is it supposed to be like this? If it is then what is the recommended OC for GTS 450 sli, and if it not how it's supposed to be how do I fix it?