I recently bought a Compaq Presario CQ62-219WM Laptop which only came with a Celeron 2.2ghz 1mb cache single core. I did my research and found a core 2 duo 2.2 ghz 2mb cahe same socket voltage etc on Ebay and installed it today. Runs like a dream! Damn HP would help, nor intel because they didn't know with HP's Bios if an upgrade would work, but it did!