thanks for answering everybody
my specs are
Gigabyte MA790GP-UD4H AMD790GX ATX AM2+/AM3 Sideport
AMD Phenom II X4 940 Black Edition Quad Core Processor AM2+ 3.0GHZ
Corsair XMS2 Dominator TWIN2X4096-8500C5D 4GB 2X2GB PC2-8500 DDR2-1066 CL5-5-5-15
Sapphire Radeon HD 4870 1GB GDDR5 PCI-E.
right now my current values are gpu values 500mhz memory clock: 900mhz. And my temperature is 54c.
Also my memory stick is set to 800mhz