BIOS Settings Help

If that's how the BIOS settings are labeled they're slightly misleading because the CPU frequencies you're listing are actually FSB (Front Side Bus) frequencies. Your CPU will be running at a fixed multiple of that.

That's a QDR (quad data rate) FSB of 400MHz system, so the FSB would be 100. Regular PCI frequency is 33MHz (and it's not something you asked, but just FYI - the AGP bus's spec frequency is 66MHz).

So you want the CPU(FSB) / PCI to be 100/33 for un-overclocked performance.

Now for the memory. PC2700 memory runs at 333MHz - 166MHz memory bus running DDR. So if your FSB is 100MHz, and you want the memory to be at 166MHz, then you want:

CPU (FSB) : Memory to be set for 3:5.

Exactly. Your FSB would be 133MHz (for a QDR rate of 533MHz) and your memory would be at a 4:5 ratio to maintain the 166MHz (DDR 333 / PC2700).

Your current "FSB : Memory" ratios look like they're based on turning the 100MHz FSB into the "base" 33MHz and then multiplying by whatever. So I bet if you had one of the 533 (B) series P4s in there it would change to allowing 1:1, 4:5, and maybe even 4:6 (which would be 200MHz). I don't know this for a fact though. My current motherboard is an Asus A7V333. It supports a wide range of FSB frequencies, and FSB : Memory options of 1:1 or 4:5.


Edit: Typo fix.<P ID="edit"><FONT SIZE=-1><EM>Edited by Yeti on 08/13/02 09:28 AM.</EM></FONT></P>

agree and UP!~^>^helpful