Not a really good idea OC'ing a laptop.
Even if you want to there arent many options in the BIOS, you can try using
Clockgen Possibly the only tool out there to OC a laptop.
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HP Pavilion TX2500..AMD Turion X2 Ultra ZM-86, 3GB DDR2 800, 320GB 5400rpm SATA, ATi Radeon HD3200/M780G.