Remember that DDR *actual* clock speed is half
the advertised speed. Your DDR2-800 RAM is designed to run at 400Mhz.
Also, FSB:RAM ratio is used to lower
the speed of your RAM. To get RAM speed, you divide
the FSB by your FSB:RAM ratio.
Example: if your FSB is 333Mhz and you have a FSB:RAM of 5:4, then the RAM speed will be 330 / (5/4) = 266Mhz.
If you want your DDR2-800 to run at full speed, you'll want to get your FSB as close to 400Mhz as possible while staying on a 1:1 FSB:RAM ratio.
I don't really know what "2.00, 2.50, 2.70 3.00, 3.50, 4.00" are in your BIOS settings. Anyone correct me if I'm wrong.
Originally posted by Ancalime
Can anyone please tell me why you would lower the multiplier when you OC? What benefit do you gain?
The performance of you CPU alone is determined by its clock speed rather than what multipliter it is being run at. So for instance having it running at 200Mhz x 10 or at 250Mhz x 8 will both correspond to a 2.0Ghz clock speed, and produce similar CPU
performance. However, the higher FSB means the CPU will be communicating with everything else on your computer much faster. So even if you lowered the multiplier, you'd still get an overall performance gain.