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4ghz stable or bust!

post #1 of 2
Thread Starter 
Ever since i got my Q9400 i have constantly dabbled in overclocking it and to a lesser extent my motherboard just to see how high it would go. My first run got it up to a respectable 3.8ghz (8x475mhz). However, this was not enough for me, and i went and started pushing harder. Couple days later i pulled 4ghz out of my hat. Admittedly, this was barely stable, and by barely stable i mean the split second i put the CPU under load my system crashed and crashed hard.
Since then, i have more or less let my CPU run happily along at 3.6ghz or somewhere thereabouts, but every now and then i would get the itch to try it again, but never really following through.
Today this changes. I am going to take this chip, and i am going to get it 4ghz stable by any means necessary. Right now i am working my way up to the desired speed, currently at 3.8ghz 8x475mhz 1.496v vcore 1.46v vNB. The extremely high vcore is to ensure CPU stability, because with this overclocking run, i want to eliminate the CPU as a potential problem. Its the motherboard that is going to give me no end to trouble as getting a Core 2 quad on 500mhz FSB stable is no mean feat, on air even moreso.

So, once this hour of prime95 blend finishes (hopefully without crashing) i am going to crank things to 8x500 and begin the war to get 4ghz stable.
In the meantime, heres a screenshot of how things are going so far.

(Clicky for the 4000 pix wide proper image)
The left part of the screenshot shows my temps and a handy graph of those temps (the Auxiliary temp i have no idea what it is, only that whatever it is is getting read wrong as i do not have any extreme cooling), the middle obviously shows prime95 running Blend, and the right screen shows speedfan (green line is CPU fan, red line is the fan i have draped over the northbridge to keep it from overheating), CPU-Z, and CPUID HWMonitor, which is up for no other purpose than to allow me to check the CPU current draw.
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Leviathan
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post #2 of 2
Thread Starter 
I am sooo close to getting it. 3960mhz 1.5v. Just one more 5mhz FSB increase and i will have it.

My board is so going to hate me though. 1.5v through the northbridge is not healthy. For that matter, 1.5 through the core isnt either.

Also, CPU-Z screenie, will do a validation once i confirm 4ghz stable. Warning: Spoiler! (Click to show)

Welp, i think i have reached this board's limit for quad cores. I cant get it to stabilize fully at 4ghz (it'll remain solid enough for a single run through 1024MB IBT, but crash through the second loop) which means i am either running into thermal issues, the board isnt giving me the voltage control and granularity i need, and/or my processor simply cant handle it anymore. Whatever the case may be, i have reached my overclock limit, and cannot go further.
On the plus side, i learned that CPU PLL can be a bastard. Here i was thinking that increasing it would increase stability when in reality it was doing the opposite.
Anyways, CPU-Z Validation, and some screenies.
http://valid.canardpc.com/2856132

Code:
Oh, and my settings:
CPU Vcore: 1.5v
GTL 0/2: 0.655
GTL 1/3: 0.675
PLL: 1.52
VTT: 1.46 (high i know, but during testing i had it as high as 1.6)
DRAM: 2.20
vNB: 1.50
NB GTL: 0.640 
Not bad eh?
Edited by Cyrious - 7/7/13 at 12:58am
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Leviathan
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