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Need help getting to 4.2ghz w/955be

post #1 of 25
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I got to about 3.7ghz with my stock AMD heat sink. The temps were really high when I ran OCCT (63*) so I didn't run the test longer than an hour. I put on a H50 and that got things into the mid 40's. I got there by just changing the multiplier. To be pass a 6 hour test at 3.9, I changed the cpu voltage to 1.425. At 4.0, I needed 1.475v and 1,500v for 4.1. During all of these, I kept the HTT, RAM Freq, NB Freq and NB voltage on "normal" or "auto". With these setting, 4.2ghz get and error in about 5 minutes of full load. Just changing the NB Freq from auto to 2000 works the same, but changing it to 2200 or 2400 and the system will not boot.
Should go back and start from 3.2ghz with everything manual?
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post #2 of 25
From what I've read, you should start by upping your clock speed first in little baby steps before you actually mess with the multiplier.

Raise the clockspeed up 5-10mhz at a time, and stress test to try to find your max clockspeed.
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post #3 of 25
Try using a 2600 NB freq with 1.25v. If it still does not boot try 1.3v. To run at 4GHz + usually requires a higher NB frequency.

and that voltage is for the CPU-NB. Not the CPU and not the NB iteself, but the CPU-NB
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post #4 of 25
I highly recommend getting another 120mm fan to do a Push/Pull fan setup on that H50, it'll greatly help improve temps, if not by much, hopefully a few degrees_

From what I found out, the LOWER your temps are the less voltage it takes to get to a higher Overclock.

On my previous Air Cooler I was getting 3.8ghz at 1.4volts and 4ghz at 1.45volts but once I changed to the H70 I was getting 4.0ghz at 1.4volts(This confirm my thoughts that the colder you keep that CPU the better it'll overclock at lower volts)

Also a good idea would be to Overclock your Northbridge FIRST** and get it to around 2600-2800mhz(Requires an increase in CPU-NB Voltage to at least 1.25-1.30volts)

Once you get your northbridge stable enough then you can move to your CPU overclock, why should you overclock the NB first? a good reason is that this will help you overclock the CPU better because an unstable NB will result in failing Prime95 tests or OCCT tests. It helps to eliminate the problem of an unstable CPU-NB. This way you don't go bumping up CPU voltage thinking its the CPU when you actually need more voltage on the CPU-NB instead

Here are my settings:
CPU Overclock at 4200mhz:
Bus Speed: 200mhz
CPU Multiplier: 21
NB Frequency: 2800mhz
Voltage control set to Manual* instead of Offset
CPU-NB Voltage: 1.256**Volts
CPU Core Voltage: 1.437**Volts

CPU Spread Spectrum: Disable
PCIE Spread Spectrum: Disable

Everything else is on Auto

Just thought It'll help you get an idea of what voltage you are to expect_
Edited by httuner - 4/10/11 at 10:52pm
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post #5 of 25
What are your temp with the H50?
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post #6 of 25
Curve-In, I know that some 955BE's require 1.550v to get to 4.2GHz, when I pushed mine to 4.309GHz it took 1.535v to do so.

The watercooler will help but it still seems your temps are rather high, at the same speeds with air cooled I was cooler than you are with the H50. Ambient may be too high.

Try using IntelBurnTest instead of Prime95, I found that IntelBurnTest will produce much quicker results while stressing your system for stability more than Prime95 in a shorter period of time.
Edited by ajmidd12 - 4/11/11 at 9:42am
post #7 of 25
Thread Starter 
Quote:
Originally Posted by ajmidd12 View Post
Curve-In, I know that some 955BE's require 1.550v to get to 4.2GHz, when I pushed mine to 4.309GHz it took 1.535v to do so.

The watercooler will help but it still seems your temps are rather high, at the same speeds with air cooled I was cooler than you are with the H50. Ambient may be too high.

Try using IntelBurnTest instead of Prime95, I found that IntelBurnTest will produce much quicker results while stressing your system for stability more than Prime95 in a shorter period of time.
Thanks, I feel a little better about my tries to 4.2GHz. From the rate of CPU voltage change to get stable, it looks like I'd need about 1.500v to get to 4.2Ghz.
I'm going to have to deal with the ambient temps I have - that's why I wanted to get to 4.2 this month. It's not going to get any cooler where I have the PC, at least not mid day.
I looked into burntest, but it didn't seem to be a good choice for AMD and I'm using Linux. I use OCCT, a cpu board temp sensor and a system monitor that shows the load on each core. If it is going to fail the test, it happens in less than 10 miuntes and usually in about 4 minutes.
Quote:
Originally Posted by dixson01974
What are your temp with the H50?
It's 76f/24c right now and the idle temp is 30c. This morning (I didn't check the ambient) idle was 24c and the stress test @ 3.9GHz topped out at 39c.
Quote:
Originally Posted by httuner
I highly recommend getting another 120mm fan to do a Push/Pull fan setup on that H50
That's what I have now with the radiator in the top of the case with the fans blowing out.

I went back to 3.2GHz and started with CPU 1.375v, NB freq at 2000 and CPU NBv at 1.15. I took things one step at a time, keeping the CPU volts @ 1.375v, upping the CPU multiplier, and used the NB freq to get it stable. I got to a little lower voltage (1.40v @ 3.9GHz) than I had last time. Going to 2800 on the NB freq, failed every test at each CPU NB voltage I tried. At the same time, 2600mhz @ 1.20 worked that same as having those two items on auto. Going up to NB CPUv 1.30 didn't help with the CPU at 1.40.
No more time for testing today. I'm going to read up on ram timing and voltage to see if that might help. I want to keep the CPU voltage kind of low, so I'm going to keep it at 3.9GHz for now.


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post #8 of 25
You'll want to be sure that those MOSFETs are cooled before overclocking that 125W processor
post #9 of 25
You need to up your CPU Freq to hit 4.2+ me thinks, at this point you are pushing the limits without upping the Freq. Change it to 216, up your CPU voltage to 1.5v (if it still dies try 1.52, and so on). When you change the CPU Freq you will need to manually set the RAM clock, keep it as close to 1333MHz as you can you won't be exactly on though.

Keep your HT Freq as close to 2.0-2.1GHz as you can IE lower the multiplier from AUTO (x10).

Take the NB Freq down a notch or two, for some reason the NB on Gigabyte boards doesn't like to be at 2.6GHz, I was able to get 4.3GHz at around 2.3-2.4GHz NB.

Your CPU-NB is running a little too much power, you should be able to get 4.2GHz stable keeping it around the 1.750w mark.

I reiterate it is the luck of the draw with the Phenom II 955's some of them overclock easily and some of them not so much.

And x2 on the MOSFET cooling, if I am not mistaken that board doesn't have any stock mosfet heatsinks. It would be unwise to OC your system to 4.2GHz for continuous use as it is, but go nuts it's your setup
Edited by ajmidd12 - 4/11/11 at 12:55pm
post #10 of 25
I have almost the same mobo. I'm running 16.5x255 = 4207.5 @ 1.55v
I don't recall exactly at the moment, but I think cpu-nb is in the 1.3-1.4v range. It doesn't like to be too much about 2400nb, but I forced it
And yes, do have some cooling on the mosfets.
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