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p4p800 divider question, among other things...

K

knyghtryda

Weaksauce
Joined
Mar 27, 2004
Messages
94
Ok, I just got my p4p800 a few days ago for an upgrade and have been playing around with it. I've been reading that the way the dividers are set up on the board, and apparently its 400/333/266 corrosponding to 1:1/5:4/3:2 respectively. The problem is, I'm running a P4-B 2.53, so the 400 selection in the bios is not available for me. Does that mean that 1:1 memory is locked out for me? I'm currently running only 1 stick of 512 pc3200, but I was just going to purchase some dual-channel pc4000. it seems that now, maybe I won't even get to pc4000 if the mem is only 5:4. Also, when I run CPU-Z and and Sandra, they give my FSB:memory as 3:4 and sandra says my mem is running at 442mhz... HUH??? I have the bios set to auto right now, but why 3:4? This board and CPU seem to OC ok, from what little I've been able to test due to my memory and heatsink limitations, but I'm just very confused as to the actual settings I'm putting in. I kind of hate the bios right now cuz I'm running into a bug where the bios screen refreshes EXTREMELY SLOWLY. I read its due to my hacked Radeon 9500 pro bios... odd... Any help clearing any of this up is appreciated.
 
I am having similar issues with my P4C800 Deluxe and my Pentium 4 3.06B Northwood CPU. The main issue that I can see is that the memory interface and CPU interface correspond to one another. For example a 2.0A Northwood has a 400MHz bus and this has a 20x multiplier. 100x4=400MHz bus. A 533MHz bus 3.06B has a 23x multiplier 133.3x4=533, and finally a 3.0C would have a 15x multiplier which would be 200x4=800MHz FSB.

Your memory by default runs at a speed parallel to your FSB speeds. Thus a 400MHz bus uses DDR266 (PC2100) a 533MHz bus would be DDR333 (PC2700) and finally 800MHz bus uses DDR400 or PC3200. This is default Intel specifications. I believe that the Abit boards have the ability to override the memory ratio due to the way Abit impliments the memory configuration. However most other manufactures if not all use the Intel formula goverening memory controller FSB ratios.

And actually your chipset controller actually won't run at true DDR333 either. It runs it at 320MHz due to some odd limitation of the chipset. I don't know why that is. I wish I could set my memory ratio to use PC3200 speeds with my 3.06B processor. But unfortunatley this isn't going to happen unless Asus can somehow fix this with a BIOS update.

My solution to this problem is to procure a 800MHz FSB processor. Which will allow me to operate my memory at full DDR400 speeds and use a 1:1 divider.
 
hehe... was worried bout that... I don't want to give up a perfectly good P4 though. What's a poor college student to do? Any tips on why my ratio is 3:4? It seems to be stuck there... no matter what I do. I have Turbo set off, and memory acceleration off, and the ratio at 333. It might be due to Asus's AiOverclocker, but I disable that and it still does it.
 
just OC till it is running at our ram's speed.

it also has to do with the speed of your ram, are you running PC3200 ram??(ddr400).

if you are stuck at 320(mine is not 333) up u/r FSB to 250, that will give you a nice OC and u'r ram will be running the same as 1:1 if u weren't OC'd, u just have a faster CPU!


just get a HT CPU. last i checked the 2.4 was like $150. they all seem to be about the same price.
 
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