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I need help getting my Phenom IIx4 955 to 4.0Ghz stable - Page 2

post #11 of 20
I'm not going to sugar coat it for you. I have the exact same chip, these CPU's have a very high TDP especially so when overclocking and extremely low thermal handling. (blame the lack of High-K gates). If you have a black edition CPU, drop everything to default and just mess with the CPU multi and cpu voltage. If you don't and have no choice but to use FSB overclocking things are trickier but you seem to have a handle on it. If your motherboard wont let you use 1.5V on the CPU 4ghz may every well be out of the question. My chip needs 1.55 to be 4ghz stable. But it is very likely you will be able to achieve a nearly identical OC (performance wise) with much less voltage. Don't get "4ghz" stuck in your head, 100-200Mhz will make nearly no difference in the stuff that really matters (non synthetic benches). See how high your voltage can go with out going over 60C, then increase the clock speed of the CPU until your unstable. I can get 3.85ghz with 1.45V but it takes 1.55 for 4ghz so there is really no point when you consider the massive thermal differences. Food for thought bro.
post #12 of 20
Quote:
Originally Posted by timma100 View Post

I'm not going to sugar coat it for you. I have the exact same chip, these CPU's have a very high TDP especially so when overclocking and extremely low thermal handling. (blame the lack of High-K gates). If you have a black edition CPU, drop everything to default and just mess with the CPU multi and cpu voltage. If you don't and have no choice but to use FSB overclocking things are trickier but you seem to have a handle on it. If your motherboard wont let you use 1.5V on the CPU 4ghz may every well be out of the question. My chip needs 1.55 to be 4ghz stable. But it is very likely you will be able to achieve a nearly identical OC (performance wise) with much less voltage. Don't get "4ghz" stuck in your head, 100-200Mhz will make nearly no difference in the stuff that really matters (non synthetic benches). See how high your voltage can go with out going over 60C, then increase the clock speed of the CPU until your unstable. I can get 3.85ghz with 1.45V but it takes 1.55 for 4ghz so there is really no point when you consider the massive thermal differences. Food for thought bro.

Upping the north bridge freq and volts can help with stability. I cannot hit 4.0 without bumping up my NB freq to at least 2400. but good advice:)
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post #13 of 20
Thread Starter 
Quote:
Originally Posted by KhaoticKomputing View Post

Upping the north bridge freq and volts can help with stability. I cannot hit 4.0 without bumping up my NB freq to at least 2400. but good advice:)

I'll try both of your suggestions and get back to you later or tomorrow, thanks.
post #14 of 20
Quote:
Originally Posted by KhaoticKomputing View Post

Upping the north bridge freq and volts can help with stability. I cannot hit 4.0 without bumping up my NB freq to at least 2400. but good advice:)

bumping the CPU-NB-VID for the northbridge can indeed help stability, but it also dramatically increases TDP. With 1.55V to the cpu and stock nb-vid I hit 45C under load. With the nb vid at 1.325 I come close to 59C. All I can suggest is to watch your temperatures. but you should be anyway. smile.gif Also, if stock or poor aftermarket cooling you may actually need more voltage to be stable. A lot of people have reported a much lower voltage requirement with proper cooling. Its kind of troll on AMD's side, you get a better cooler to fix the heat problem your CPU doesn't have any more lol
post #15 of 20
My temps stay pretty good. But I also dont have 1.55vcore:) I run 1.450, and suffer from slight Vdroop. Under load Vcore hit's 1.440, temps stay fine in my warm house lol. but each chip is different. and yea, better cooling can drop the voltage needed for an OC, kinda weird.
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post #16 of 20
Thread Starter 
I thought I put it in my signature, but I have the Zalman CNPS 10x
post #17 of 20

Considering the low end 4+1 phase VRM setup that is known to have issues when pushing processors to high TDP values, I really don't recommend you even consider pushing your Phenom II x4 this far - much less be overclocking at all - on this motherboard.

post #18 of 20
I hereby add +1 to the warnings about overclocking on the msi board, there are firey devil.gif stories on here about em
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post #19 of 20
Thread Starter 
So I just need a new mobo?
post #20 of 20
Go with ASUS...

Getting my system to 4ghz was only possible with full Loadline Calibration, so I have little vdroop, as well as 2.8v VDDA
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