PC2700 or P4, which is holding me back?

[MrPeepers]

My new system is getting failures on Prime95 and I can't tell if it's the DDR or the CPU.

P4B533
1.8A P4
Kingston PC2700 512MB

I want to get as high as I can at 4/3 ratio. Technically 125Mhz is not overclocking the RAM, that's 166Mhz, the spec speed right? But Prime95 fails at 125Mhz.

I think as high as I get is 123Mhz, which is only 2.21Ghz on the CPU. The DDR is on auto at 2-3-3-6 (higher is more conservative right?). I'm now leaning towards upping the Vcore for the CPU, since the memory isn't even maxed. Right now the Vcore is 1.525, what is a safe voltage? Is say 1.6V normal or too high? System is very cool, never even getting over 50C during 100% load via games or Prime95. I think I have like 7 fans in/on the case.

Any help would be great, thanks.

 

[zer0burn]

most likely its your ram. Up your vcore to 1.6 thats completely fine just dont go above 1.7 Raise your ram to 2.6

 

[Duvie]

I think it is the vcore is too low....The ram should be fine at that low speed regardless the timings at this point....keep the cas rating to it rated speed though...Is it cas 2 or cas 2.5??? Put it on that for now...

What is the error in prime??? Usually if it is hardware failure it is related to ram of mobo....The usual error for cpu will be the rounding error....

If it is hardware failure try bumping vdimm up to 2.6v...baord may be supplying insufficient 2.5v to ddr...I have seen it...


Ultimately you are going about ocing wrong here....

1) find the cpus limit first then start tweaking memory...YOu want to hammer out the voltage needed at each point and keep other variable like ram out of it for the time being...put it at 1:1...see the mess you have gotten now??? If you had it at 1:1 and it failed it would undobtedly be cpu vcore....If it passed then you bumped up the memory to 3:4 then it failed, it would be obvious then....


I think 1.65v is safe with adequate cooling....


It is likely that ram could run at up to 375mhz or a fsb of 140....Lets try to get that stable at 140fsb first then see if the ram can take it...if not you at least know the cpu can then you can back off only for the ram...Baby steps ppl!!!