BIOS locks GPU clocks at stock?

Hi, i have a DV5-1157ca with a P7350 and 9600m GT 512ddr2 and this has 500 clock, 400 mem clock + 800 shader clock.

I downloaded rivatuner and EVGA Precision and i enabled overclocking with rivatuner and used EVGA precision to raise the clocks to a 640/570/1280 but when i used GPU-Z to check the clocks were still at 500/400/800 so......how do i overclock? i have a F.0B BIOS from HP
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More about bios locks clocks stock
  1. I wouldn't OC with a laptop. There is no way for it to deal with the extra heat.
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