The GPU load is suppose to be 90%~100%, right? His CPU load is just only 16%, which is fine?
What's the target CPU load to stay around at to get peak performance?
GPU load does not show anything. If different catalyst version is used than 13.12, it will compile OpenCL code into different instructions and it will cause huge speed down, though GPU still will be loaded completely. Because GPU works slowly, CPU load is low too, CPU prepares data for card, card is faster - more data is required - more CPU load, and vice versa.
If driver crashed - need to reboot computer to restore card speed. In some times it is necessary to reinstall drivers. Also v2.0 uses card more, so use less clocks than for v1.5.