Memory divider for P4P800

Revolutionary

Senior member
May 23, 2003
397
0
0
NEWB QUESTION: Does anybody know what settings I would use in the Asus P4P800 BIOS in order to acheive a standard 200MHz FSB (800MHz quad-pumped), and standard DDR400 memory speeds. I thought I would do this by setting the CPU "frequency," as the BIOS puts it, to 200 and the DRAM Frequency to 400. But I've read on ABXZone.com that what I'm really setting is a divider, and that setting the CPU frequency to 200 means I'm setting a 1:1 ratio, meaning that the memory will now run at 200MHz, not 400MHz. Is that true? Why wouldn't it be more straight forward? Also, the manual says that the CPU Frequency is adjustable from 100 to 400. Mine caps at 200. The advice given to me was to set the CPU frequency at 250, but the memory at 333, so that I have a 4:5 divider. That would boost the CPU to 3.0 and the memory would stay at DDR400. But I don't want to overclock. So what do I set for 800MHz FSB and 400MHz memory? And how would I even go about setting the FSB to 250? Is there another hidden page or field or something? Really confused...........................
 

Tom

Lifer
Oct 9, 1999
13,293
1
76
I don't have a p4p800 but it probably works like other boards..

As you know the base cpu fsb, say 200, is multiplied by 4 to get the 800fsb quad pumped number.

Similarly, DDR is double data rate, so setting the memory to 200 actually gives you 200x2 or DDR400.

So you want a 1:1 ratio to get where you want, 200 for cpu frequency and 200 for dram frequency.
 

cjsketchy

Senior member
Jan 23, 2002
401
0
71
^ what he said. :)

What you read is true... for a cpu frequency of 200, and ram at DDR400, you will be running at 800fsb and DDR400. The P4P800 bios is a little confusing, but, in the end, it works the same...