Let's see if I can figure out what you are asking ...
Definition time (attention purists, I'm talking about DDR2 and I'm simplifying a little
):
Core2 CPU's use a frontside bus (FSB). The FSB is a
thing with two main characteristics: speed which is usually defined in MHz and width which in the Core2's is 64 bits wide. We are concerned with the speed.
Using the Q6600 as an example, the FSB (also sometimes known as "host")
frequency is 266 MHz. The matching DDR2
memory clock for that frequency is 533 MHz (266 X 2). DDR2 memory transfers two chunks of data for each bus cycle, hence double the frequency. So, to run a 1:1 ratio at an FSB of 266 MHz, we need DDR2-533 RAM. What CPUZ does is a little confusing. It will tell you that the memory
frequency is 266 MHz for a 1:1 ratio. So each FSB cycle generates 2 memory clocks.
The FSB
clock is 1066 MHz (266 X 4). The bus is "quad pumped". It transfers 4 chunks of data into and out of the CPU each cycle. So each FSB cycle generates 4 FSB clocks.
Now, if you increase the FSB frequency to 333 MHz, the corresponding memory clock is 667 MHz and the FSB clock is 1333 MHz.
The OS question? Can't help.