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Phenom II 955 BE - almost stable at 4.2 GHz? - Page 5

post #41 of 54
Quote:
Originally Posted by StealthRuler View Post

I think you should lower RAM voltage to 1.5V if you use it on 667MHz, 1.65V is for 800Mhz and highter.
Lets OC together i need help bro

Actually, almost all amd boards other than the 890fx/gx models fail to run memory modules at low voltages (in high speeds). 1.65v is ideal for that ram.... he may even have to increase it by a slight margin just to get stability memory-wise, even if he wants to run the ram at stock (company specified) values (which in this case are 2000MHz cl9 1.5v). It is almost impossible to run the ram at 2000mhz with 1.5v on that board.
    
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post #42 of 54
Personally I like my 955 to run 100% stable. But if you think you need that extra 100 or 200 MHz then run it like that and hope you don't begin having crashes that can damage your chip or other components. After all, running Prime is really the only time you will be running your system at full throttle like that.
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post #43 of 54
Quote:
Originally Posted by PhillyOverclocker View Post
Personally I like my 955 to run 100% stable. But if you think you need that extra 100 or 200 MHz then run it like that and hope you don't begin having crashes that can damage your chip or other components. After all, running Prime is really the only time you will be running your system at full throttle like that.
You have the postbit but also say that running Prime95 is the only time you run full throttle,Hmmm?
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post #44 of 54
Thread Starter 
Quote:
Originally Posted by leopold1985 View Post
Hmmm, I saw the chart. its probably the chip being unable to sustain such a high oc, very common. Anyway, try this out just to see what happens..... stress test with occt/linpack and see if its stable. Also try the previous setup with cpunb at 2500mhz -- 1.3V.
I'm on Ubuntu Linux and therefore can't really use OCCT or any of its tests. I tried, however, installing it using Wine and got a bunch of errors. Even the standalone program doesn't work.
If you know a better tool for Linux other than Prime95, please feel free to let me know.

On my lastest test, I left everything at stock levels and then did 225 x 17.50, reaching 3.9 GHz. After 13 hours of Prime95 Blend and Small FFTs testing, no errors. I think that's my limit at stock.
I can probably drop CPU/NB freq to 2.5 GHz, but 1.3v seems way to high. Also, what else should I increase?

Quote:
Originally Posted by leopold1985 View Post
just noticed it.... if your ram is rated at 2000mhz, run it at that speed. i thought it was 1333mhz model.
My SPD is 1333 MHz, but the tested speed is 2000 MHz. For more info: http://www.corsair.com/cmt4gx3m2a2000c8.html

Quote:
Originally Posted by leopold1985 View Post
ps: thanx for messi
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post #45 of 54
Glad you got it stable at 3.9GHz. Have you tried pushing the CPU higher while leaving everything else at the successful settings?

As far as CPU-NB voltage, I think I have mine at 1.2 for my 2750MHz NB frequency.

Also, are you running the Small FFT test and blend test one after the other? I think that the blend test ends up covering the same ground when it gets a few hours in.
    
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post #46 of 54
Quote:
Originally Posted by pablo.santiago View Post
My SPD is 1333 MHz, but the tested speed is 2000 MHz. For more info: http://www.corsair.com/cmt4gx3m2a2000c8.html
Do not worry about SPD values. Try to run the modules at their rated settings or at least near 1800MHz mark. Get cpuz (if there is a linux version of it) and post the screenshot of the SPD tab here. You dont need to change anything else right now. Once the memory speed is adjusted then you can start to push the cpu OC even higher. And also, grab the latest version of prime95, the older ones had some issues like crashing on high OC settings.
    
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post #47 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
Glad you got it stable at 3.9GHz. Have you tried pushing the CPU higher while leaving everything else at the successful settings?

As far as CPU-NB voltage, I think I have mine at 1.2 for my 2750MHz NB frequency.

Also, are you running the Small FFT test and blend test one after the other? I think that the blend test ends up covering the same ground when it gets a few hours in.
Yup, I tried raising the multiplier 0.5 (leaving everything else at stock levels) and all tests failed. Didn't try upping the FSB beyond 225, though.
I agree with you, I think 1.2 is a safe voltage for CPU-NB. I'll keep that value.

Except for the one I left +13 hours (and passed), every other test I ran them one after the other. Small FTTs failed after +2 hours and I guess that's because it increased the size of the FFT which is why Blend fails at startup. Since I realized that, I've been running Blend first.
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post #48 of 54
Thread Starter 
Quote:
Originally Posted by leopold1985 View Post
Do not worry about SPD values. Try to run the modules at their rated settings or at least near 1800MHz mark. Get cpuz (if there is a linux version of it) and post the screenshot of the SPD tab here. You dont need to change anything else right now. Once the memory speed is adjusted then you can start to push the cpu OC even higher. And also, grab the latest version of prime95, the older ones had some issues like crashing on high OC settings.
There's no CPU-Z for Linux. This is the nearest I could get using lshw:
Code:
     *-memory
          description: System Memory
          physical id: 33
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: DIMM Synchronous 800 MHz (1.2 ns)
             product: CMT4GX3M2A2000C8
             vendor: Corsair
             physical id: 0
             serial: 00000000
             slot: DIMM0
             size: 2GiB
             width: 64 bits
             clock: 800MHz (1.2ns)
        *-bank:1
             description: DIMM Synchronous 800 MHz (1.2 ns)
             product: CMT4GX3M2A2000C8
             vendor: Corsair
             physical id: 1
             serial: 00000000
             slot: DIMM1
             size: 2GiB
             width: 64 bits
             clock: 800MHz (1.2ns)
I should probably mention that my latest settings are: 200 x 20 (4 GHz) with DRAM freq at 1600 MHz. I think that's why it rates speed of each stick at 800 MHz.
So far, Blend testing has not failed. I'm confident on this settings. Will try to push it further while keeping RAM at maximum.

I'm using Mersenne Prime Test Program, Version 26.5.8.
I think it's the latest version.
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post #49 of 54
Thread Starter 
Sorry for the double post, but I have an update: I ran a Blend test for 45 minutes with the following settings:
  • CPU: 200 MHz x 20 - 1.5v
  • CPU/NB: 2400 MHz - 1.2v
  • HT Link: 2000 MHz
  • RAM: 1600 MHz - 9-9-9-24 - 1.65v
No errors reported.

However, when increasing the CPU ratio to 20.5, Blend test failed (Small FTTs ran fine for 7 minutes).
In consequence, my assumption is that RAM is failing (possibly falling behind CPU speed?). In any case, as I have not changed any RAM or NB setting, what could I possibly change to make the test pass?
Edited by pablo.santiago - 3/27/11 at 5:08pm
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post #50 of 54
Quote:
Originally Posted by pablo.santiago View Post
While the test runs there's something really odd I'd like to discuss with you... the voltage I set and the one both BIOS and lm-sensors display is not the same. For example, when I set VCore to 1.525v, BIOS' hardware monitor said it's at 1.476v and lm-sensors 1.43v.
Any idea what could be causing different readings?
As far as I know, and it aint muc, the Vcore moves up a bit under load mine does anyway. 1.462500 in bios shows as 1.476 in Aida extreme and goes to 1.5 under full load
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