Almost... DDR = Double Data Rate. FSB clock = 333, Ram clock runs at Double = 666Mhz. It isn't 333Mhz per stick. Dual Channel increases the memory bandwidth, which alleviates the issue of bottlenecking between processor speed/bus width and memory controller/memory speed. Looking at the site you linked, all that means is that are different revisions of the same processor and there might be different bios required for different ones, or just no compatibility. If you expand the row of information by clicking on the [+] on the far left you'll see: Code: Spec# Processor Frequency Intel HD Graphics Cache Bus Speed Min. BIOS Version Compatible Board Revision SL9ZF 2.66 GHz No 4 MB 1066 MHz 0010 All SL9S7 2.66 GHz No 4 MB 1066 MHz 0010 All So if you have BIOS 0010 or newer you should have no compatibility issues with using that processor.