thanks everyone,
I have done a tons of research and many of them reported that has something to do with CCC profile.
here is the a list of software that I have used:
easy tune6 comes with my gigabyte ud3r-b3 motherboard
AMD Software Suit
GPU-Z
AIDA64
I have done NOTHING to tweak any setting such as overclock or adjust frequency of any kind , core/memory/etc.
I have uninstalled easytune6 and the GPU core clock is able to move between 250-775 now depends on GPU Load, however the memory cloak remain the same, constantly at 1000Mhz, according to member happy medium that has to do with dual monitors setup, which I have also heard on GTX570 as well, the memory cloak would not decrease itself during idle.
ImDonly1 is correct, I should have GPU at 100 and memory cloak at 150 at idle.
To summary, my new problem is that this hd 6850 is idle at Core 250 and memory 1000.
I will try to unplug my second monitor and report back