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post #11 of 25
that might be thermal throttling they call.

your cpu may have not reached ceiling but your cooler did.
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post #12 of 25
Thread Starter 
Not sure I understand. I can run prime 95 small fft's with no problem. It is when I run the blend test that I start getting the bsod's or cores dropping out. There has to be something bottle necking between the cpu and the ram. I just ran Memtest for 4 hours without any errors so I know it isn't the ram.
    
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post #13 of 25
Well being able to run small FFTs would indicate that the CPU is stable. You said memtest passed so you can assume that the ram is also stable. So the only other part of the system that could be unstable is the cpu-nb. Try upping the voltage on the cpu-nb or reducing the speed of the northbridge.
    
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post #14 of 25
use a combination of reference clock and multi. the cpu-nb on thubans usually hit 3000mhz with USUALLY 1.3-1.45v
passing memtest doesnt mean the ram is stable. it just means you probably have good ram.
dont forget to keep your ht link and ram as close as possible to stock to help with stability once you start upping the base clock.
a lot of people suggest setting llc around 20%

all the help i'll give til we all know more.
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post #15 of 25
Thread Starter 
Ok back at it again and I thought I was completely stable at 4Ghz. I can run Prime 95 for 2-4 hours and then the system shuts down and reboots. I was getting ready to start trying again to get to 4.1 and then 4.2 Ghz today. I wanted to double check to make sure I was still stable at 4Ghz and started Prime at 6:15am and watched it run for 2 hours. We left to go buy groceries and came back and the system had restarted with the dialog box saying windows had recovered from a crash. Anyway I can run Intel burn test at the second from highest setting with current settings and pass every time. What could be causing the crash when running prime?

Here are the current settings and a screen shot of where I passed IBT.

I also just replaced my CM Hyper 212 Evo with a Noctua Nh-d14.

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post #16 of 25
Check your temps on the NB mosfets and heatsinks. Mine would crash hard because they would get over 150F for some reason
 
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post #17 of 25
Thread Starter 
Forgive my ignorance but how do I check those temps?
    
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post #18 of 25
I'm in your same boat,

I thought my 4.12 clock was stable but I ran into snags every once an awhile.

I can reach a stable 4.2 with 1.55 volts, but at that voltage this chip becomes so incredibly inefficient its ridiculous.

However I'm able to keep a VERY nice 1.44v @ 4040mhz and 2.8ghz NB @1.375. There is nearly no worldly difference between 4.125 and 4.04. (although I don't like the number as much lol rolleyes.gif)

However if you keep at it, I will suggest pushing the NB voltage if you find blend is not stable. Blend taxes the hell out of the Memory controller (Cpu/NB). I've found that the NB will always need a jump as CPU clock goes up regardless of if you are pushing the NB clock itself or not.

Funny thing however, when NB voltage is applied its almost like there is another step of clock capability.

Example: Your @ 2.5 Nb right now... You might need to jump your NB to 1.35v for stability. But once you do, you will more than likely be able to get another multiplier worth of clock out of the NB while still staying stable. (say 2.7-2.8)

My NB takes 1.375v to stay stable @ 2.8 just for reference.

OH, and there is a ton more performance to be had from a higher NB clock than the CPU clock after 4ghz. (100mhz on the memory controller will net you MUCH more performance vs 100mhz on the core)

GL!
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post #19 of 25
Thread Starter 
Took your advice and used basically the same voltages as you. I am at 4013Mhz and have 2.5 hours left on a 24 hour prime95 blend run. Max core temp is 42C (19C above ambient) have been floating around 40C.

4013Mhz @ 1.44v I have llc at extreme and it is going up to 1.452v
nb at 2.6 and 1.35v

Everything is looking good right now only a couple hours to go. Then I may try tweaking a little more and raise the FSB a couple of points, lower the voltage one notch each. Doing one thing at a time and then testing stability again.

Thanks for everyone's advice.
    
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post #20 of 25
Quote:
Originally Posted by billcox0625 View Post

I think I need to stop for tonight because I am getting a little too drunk to concentrate.

doh.gif Please do not overclock when you have been drinking. I learnt that lesson the hard way. Fried my 9800GT putting in a rediculously stupid voltage. It ran for all of 2 seconds. blushsmiley.gif

hangovers dont make for safe overclocking either.
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