I used to be more up to date on the Intel FSB structure, but I'm just not sure with the C2D chips.  They have a rated FSB of 1066MHz.  Now, if things hold as they did in the past that means a quad pumped bus; actually two DDR busses running 90 degrees out of sync.

Does this mean that the actual clock frequency is 266MHz, thus requiring DDR2-533MHz (PC2-4200) as the minimum speed DDR2 RAM for this chip?