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!!! :eek:

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 :p 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]

Originally posted by [BBE]Jimbob
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]

Originally posted by [BBE]Jimbob
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 :p


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

[Grandpa Dan]

What are the ram timings at? vdimm? will it run a clean pass of memtest? Just because you tried a 3:2 divider doesn't mean it's not a ram issue.

[Jimbob7]

hmm i have 3:2 gat last to disabled ive try normal and loose timings when i get new floppy drive ill try mem test oh and one stick of ram i have not tryed hmm ok ill see how it goes :)


vdimm i have tryed from default to 3.2 hehe

cheers :) Scott

[Grandpa Dan]

we'll be patiently waiting http://www.fancysplace.com/smileys/whissle.gif

[shortbus_]

what are your timings? i had a similar situation until i loosed them to 2-3-2-6 ;)

[Jimbob7]

hmm i tryed the standard timings and ive tryed REALLY lose timings hmmm

[arklab]

Here's a few more ideas to check out.

Have you run memtest (at overclock) to double ckeck RAM suitability at that speed?

Have you checked the biggest hidden OC (and even stock, sometimes) problem?
Voltage.
Not just what BIOS or windows monitor prog.s show, but with a multi-meter or even more advanced testing.

Rember the very old computer rule GIGO ... Garbage In, Gargabe Out.

When we overclock, we really push everything to the limit. At these demands it is imparitive that every aspect of the "juce" we are feeding to the mobo is "perfect".

First check for enough volts INTO the mobo.
Got just enough, but not too much on ALL rails?

Fine, as far as it goes. But is it GOOD, CLEAN voltage? :eek:
No spikes, ripples, or other unwanted trash?
Don't depend on the mobo to clean up for you. It is already pushed to the max by the overclock.

One solution that MIGHT help here is a true UPS (Uninteruptable Power Supply). Try to find one that can support your system demands AND is the "constant flow" type where it dosen't just sit by the side waiting for a power failure, but constantly filters the electricity.
This type usually outputs a "square wave", rather than a "sine wave", but should be just fine for the mobo.

You can usually find these in a store that will allow a one month return policy, so if it doesn't help, no harm to your wallet.

I got more, but it'll have to wait till tonight. My boss kinda expects me to BE at work. Go figure! :p

[Grandpa Dan]

Is the agp/pci locked at 66/33?

[Jimbob7]

arklab thanks for your reply, i think that i will do that when i start running out of things to try :P


And yes it is locked at 66/33 ive got some time tomorrow to check the ram with memtest and use 1 stick of ram, i also have some pc2100 from the folding rig i can use although that wont get me very far :P hehe

cheers