Well, my GPU is acting strange lately.
The GPU usage are nearing 100% (and the core clock and mem clock are clocked to the max, the temperature is high too) when the PC is idling.
This problem kicks in within couple of minutes of idle on the desktop (with no apps running).
But when I moved the mouse the GPU usage back to normal (0%), and the GPU clocks down to normal idle state.
And if I keep it idle again for couple of minutes, the problem occurs again.
I begin to realize this problem since Radeon Software 16.4.2.
I've updated to Radeon Software 16.5.1 but not fixed this problem.
My PC Specification :
AMD Phenom II X2 555 @3.2GHz
XFX Radeon HD7770 1GB
Windows 8.1 Pro
AMD Radeon Software 16.5.1