Its the speed I have at the moment, but only have 2 gigs.
The ram I have is unreliable, out of 6 sticks only 2 were good, so I wanted something more reliable.
CPU - Intel Core 2 Duo E6600 "LGA775 Conroe" 2.40GHz (1066FSB) - Retail
Mobo - Gigabyte GA_965P_DS3P (Socket 775) PCI-Express DDR2 Motherboard
Ram - Crucial Ballistix 2GB (2x1GB) DDR2 PC2-5300C3 667MHz Dual Channel Kit (BL2KIT12864AA663)