AMD Overdrive - no GPU status

Hope someone here have use AMD Overdrive to monitor their system status.

I had just installed Overdrive and found that the GPU status are all grey out (all zero). Doesn't the Overdrive can auto detect the display card ?

AMD phenom ii x6 1090t
ATI 5870

AMD overdrive doesn't detect my HD4870's or HD4850's status either. Don't know what the problem is but I use Rivatuner to monitor my system.