2.4m0 @ 270 to 300

[Jimbob7]

hey, im really confused as to what is wrong with my overclock. My system is the main rig.


Right i can boot into windows at 300fsb with 1.7v but im not prime stable untill i back down to 270!!!

i have done the normal things eg loose timings ratio 3:2 vga vcore up vdimm up as far as 3.2 and hyperthreadin on / off.

i havent a clue why this is happening, also my temps are 35c idle 43cload


Thanks for the help to come Scott

 

[Grandpa Dan]

will it boot with a lower vcore? too much can cause as much trouble as too little.

 

[Jimbob7]

i can run 270 stable with 1.55 stable

 

[Grandpa Dan]

I would recommend letting run at the stable speeds for a few days. Then try again. It used to be I thought burn-in was a myth, but It took about 3 weeks before I could hit my max oc.

 

[Jimbob7]

what was ur max to start with ? and now 295 very nice

 

[Grandpa Dan]

I hit several rest stops en route. 255, 262, 285ish, 300. I can run stable at 303-305 but that requires a 3:2 divider. At 295 I'm using the 5:4. Plus over 300 most boards lose their agp/pci lock. 300 is a point of diminishing returns with the 865/875 mobos.

 

[Jimbob7]

so what should i do now? run at my highest stable overclock? or run stock ?

 

[flapperhead]

if the thing boots into windows at 300, having to drop all the way to 270 to get stability is too much. make sure the rest of the periferals, memory mb etc are setup correctly... i can boot at 295 but 290 is stable. usually a 5-10 fsb drop will stabilize the cpu..

 

[Jimbob7]

make sure the rest of the periferals, memory mb etc are setup correctly



Do u mean like timings and 3:2 ratio ?

 

[Grandpa Dan]

I would go highest stable oc for a day or two. Do some looking around the forums maybe you'll stumble on something we(all of us) aren't seeing. Here is a start: http://www.tweaktown.com/document.php?dType=review&dId=577

 

[Jimbob7]

ok ill try that then and let it fold+prime95 overnight and fold tomorrow


Anyone else know what could be wrong?

flapperhead could you go into more detail about what you said before?

 

[Flakk]

i have a very similar situation. i have to run at 270 fsb also for 100% prime stability (1.5625 vcore). see my specs below for my current stable setup.

I can boot into windows much higher, but just not stable...

I've tried a lot so far and nothing works so I am getting new ram (1gb Kingston HyperX PC3000) on the 30th, a fan on my northbridge, and new heatsink (Zalman 7000) in hopes that one or all of these will contribute to a higher FSB. =)

i've tried relaxing my memory timings as far as they will go, disabling certain settings in bios, and nothing does it so far... hopefully its just my memory.

the only other possibility we must face, if none of this works, is that our CPUs just arent the cream of the crop like everyone elses. Not everyone can be lucky. But i refuse to accept that yet

Will report back

 

[Jimbob7]

yeah i saw your thread what pack date is your chip? not that it really matters that much hehe

 

[Flakk]

yeah i saw your thread what pack date is your chip? not that it really matters that much hehe

mines a pack date of 10/14/03

 

[Jimbob7]

mine is 09/15/03

 

[Flakk]

perhaps it makes a difference... perhaps not.. maybe we'll never know

 

[Grandpa Dan]

ok ill try that then and let it fold+prime95 overnight and fold tomorrow

Make sure your error free.

 

[Jimbob7]

13 hours of prime and folding it is fine at 270

Just have to see if i can go any higher in a few days or if someone knows any other reason why i might be stuck at 270 but can boot into windows at 300fsb


Cheers

 

[gakkuken]

someone please direct me to a good vendor to purchase a 2.4c m0 chip...thx!

 

[Jimbob7]

ok i have been dual priming now for 2 days now i know this is a little early for this so called burn in to work but still no go past 270fsb prime stable even tho i can boot into windows at 300fsb. Does anyone know anything that could be causing this problem?? im really stuck on this one


Cheers Scott