It does work! Even on my 2 year old comp) Speed boost is something around 10-12%.
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P4 2.4 (OC 3.15 GHz)||DDR SDRAM PC3200 512 Mb||Seagate Barracuda 80Gb||ATI Sapphire Radeon 9600 128 Mb||DVD+/-RW NEC 3520A (Firmware Upgraded to 3.06)||WinXP Professional SP2