AtomicGPU :
das_stig :
You don't specify the exact model of DV6500, so with the latest BIOS, you "should" be able to upgrade to
Turion TL-66 (2.3 -GHz, 1-MB L2 cache - BEST OPTION £10-£20 on eBay!
Turion TL-60 (2.0 -GHz, 1-MB L2 cache)
Turion MK-38 (2.2 -Ghz, 512MB L2 cache)
It currently has a TL-58, and actually now that I look at it again, it say that it's a dv6636nr. I also recently updated to the latest BIOS by searching for the serial number, and downloading the latest BIOS from HP.
You can go as high as a TL-68 which is 2.4 ghz, but like I said won't be a huge jump. If you can find one for cheap, then go for it, just don't expect a miracle.
https://en.wikipedia.org/wiki/List_of_AMD_Turion_microprocessors#.22Tyler.22_.2865_nm.29_2...