thx for the fan command , it works
Donated 0.2 BTC ( poor right now ^^)

But I can't set the clocks:

ERROR: Set clocks failed for apator 0 Ati radeon 5800 series
Please check that the input values were valid

About AtioverdriveCtrl,
Where can I find a 32 bit version?
I could only find x64 :s