CPU voltage going up and down. Normal?

[cnick79]

CPU voltage going up and down. I have my cpu set to 1.65v and I notice on CPU-Z the voltage is going from 1.648 to 1.632 and sometimes to 1.552. Could this be causing a problem when I'm trying to OC? My overclock results haven't been that great compared to the norm. I've been able to run 3:2 ratio, 2.5-3-3-6 timings at 220mhz FSB on my P4C800E-Deluxe P4 3.4ghz and 1gb Corsair DDR400. Right now I'm running 205mhz 1:1 at the same timings. Once I start pushing 225mhz things start to get hairy and once I hit 230mhz I run into all sorts of problems. My power supply is an Antec 550W true control or something like that. I do have the ability of adjusting the +12v +5v +3.3v with a turn of the button. In my bios it doesn't show my +12v being exactly that but a little under.

 

[Rix2357]

see this thread same applies to all Asus p4p and p4c motherboards
http://www.hardforum.com/showthread.php?t=840308

Basically need to do a droop mod for your motherboard. If you want to attempt it the directions and solder points are at www.malvescorner.com. If you want more information, then searching through the forums at www.xtremesystems.org is your best bet.

 

[cnick79]

So is the voltage dropping causing for such a crappy OC? Is there a certain degree of fluctuation in volts before the system freezes?

 

[cnick79]

Ok, I bumped my vcore up to 1.675 and my FSB to 231mhz. My DDR400 was set to 266mhz with timings of 3-4-4-8. I noticed at idle the CPU-Z showed the voltage going from 1.80->1.664 every few seconds and occasionally (every 5 minutes?) dipping to 1.568v while I was web browsing. I fired up prime95's torture test and watched it go to 1.536v->1.552v until it froze at 1.536v. BIOS was showing my powersupply at 11.916v, 4.972v, 3.232v so I upped it to 11.977v, 4.972v, 3.296v thinking it would provide some more stability. CPU-Z was still showing the same vcore fluctuations and when I fired up prime95 again my computer froze at 1.552v.

Does anyone know if my P4 3.4ghz, PC4800-E Deluxe is freezing up because of this vcore drop? Generally what is the max accepted value? I don't want to perform the droop mod if my vcores are fine.

I checked those above sites and only found people having problems with their droop mod. Can anyone answer my questions?

I guess what I'm looking for is how much fluctuation should there be?

 

[cnick79]

I'm thinking about saying F-it and do the mod. What harm could it do? I'll probably get the 50K trimmer and set it to 28k. Is that all there is to it, just solder the trimmer and those two wires to the pins?