Question about fsb speeds.

Energize · 19 Jul 2007 at 20:44

Ok so if you have an intel c2d cpu running at an fsb of 400Mhz then you need ddr 800 ram right? Does that have to run in dual channel mode to provide enough bandwidth or is single channel mode enough?

jellybeard999 · 19 Jul 2007 at 20:58

Makes very little difference outside benchmarks, though you will see an improvement if gaming on onboard graphics.

Columbo · 19 Jul 2007 at 21:04

Energize said:
Ok so if you have an intel c2d cpu running at an fsb of 400Mhz then you need ddr 800 ram right? Does that have to run in dual channel mode to provide enough bandwidth or is single channel mode enough?

Not really. Everything set to Auto the hardware will run at default speed. However when overclocking if I set my FSB to 400mhz I can then set my FSB RAM multiplier to whatever I choose. So currently I have an FSB speed of 430mhz and my RAM multiplier is set at 2.5x. RAM speed = 1075mhz.

Its basically completely up to you how you set it.

Energize · 19 Jul 2007 at 21:25

If you are running a 1:1 ratio though, does running in dual channel mean the ram fsb can be 200mhz and still provide enough bandwidth for a cpu running at 400mhz fsb?

How many instructions per clock cycle do c2d cpus have? If it's 4, then surely you would have to run 2 sticks in dual channel at the same fsb as the cpu to give the correct amount of bandwidth?