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955 Overclock stability advices.

post #1 of 35
Thread Starter 
Hello there, I want to overclock my P.II955be But i don't know ho w to test his stability properly, i mean... what program should i use? is prime95 alone just fine? how long should i keep it under full load to tell if it's rock solid ?

I have tested 30 minutes beacuse i had to leave home and didn't want to leave that testing without me being there... maybe it could have crashed and i wouldn't know.

Any help is appreciated ! Thanks in advance!
Edited by WhiteEyeTree - 2/2/12 at 11:26am
post #2 of 35
Quote:
Originally Posted by WhiteEyeTree View Post

Hello there, I want to overclock my P.II955be But i don't know ho w to test his stability properly, i mean... what program should i use? is prime95 alone just fine? how long should i keep it under full load to tell if it's rock solid ?

Yes P95 is the best stability program ever. For a quick result try with small FFT's first may be 30 minutes. And for the instantaneous stability try "In-Place Large FFT's" for 12 hrs at-least. If possible try 24 hours and if it passes load a CPU HOG game, may be GTA-IV or etc for ensuring ROCK-SOLID STABILITY. You can leave home just after making sure that the CPU-Core temp never exceeds 56°C at the MAX if on air. You will have an idea of the temp after watching it for first 30 minutes of the test.
    
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post #3 of 35
Thread Starter 
Ok thank you very much, my temp is about at 54-55... on stock cooler ( shh don't tell anyone xD )
I'll start testing right ahead!
post #4 of 35
Thread Starter 
what if it reaches 57.7°C as max temp? is that too much or it can still do the job?thumb.gif
post #5 of 35
Quote:
Originally Posted by WhiteEyeTree View Post

Ok thank you very much, my temp is about at 54-55... on stock cooler ( shh don't tell anyone xD )
I'll start testing right ahead!
lol you are welcome !
Quote:
Originally Posted by WhiteEyeTree View Post

what if it reaches 57.7°C as max temp? is that too much or it can still do the job?thumb.gif
Wait.. when you say 57.7°C, are you referring to Mobo temp sensor ?. If that's the case, then you must monitor each of your CPU cores temp either by CoreTemp or HW-Monitor which displays more realistic situation. Usually Core-temperature would be 2~5°C higher than the Mobo socket temp sensor. If that's the case then may be have already crossed the limits by taking your CPU to 60°C which is an extreme temp for this particular CPU and you should certainly stop the test.

Now if these nothing were the case and you were referring to the Non-socket Temp, then i would still say go till 57°C at the max or else stop the torture tests and lower the CPU-voltages where it hits at a max value of 55°C~56°C.
    
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post #6 of 35
Incorrect information. Not that mine's 100% correct but this is what I learned from the start and which AMD's people also confirmed on their forums.

The Core temps are NOT physical sensors but they are calculated value's.
Idle they are usually way off and load they come increasingly close to the real value but it's never accurate.

The CPU temp, or socket temp, is a physical sensor and that's the temp AMD gives as max temp. The max temp for that is 62,7c but usually under stresstests you're fine to about 64-65c.

Coretemps are usually quite a lot lower then the CU temp as there's 4 cores heating it up and the core temps don't affect eachother since they're calculated value's.
For a x4 the core temps are usually 6-8c lower then CPU under full load. With a x6 it's usually even 10-12c.

This is all the information I got from personal experience and from the AMD forums.

Those temps, if they are CPU temps and not core temps, are fine. If they are coretemps, well, it's close. Your probably hitting around 63-65c CPU but if under your normal day to day usage it stays under 55c load, or for core temps under 50c, then you're still fine.
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post #7 of 35
Thread Starter 
No, i was monitoring that with HWMonitor and AOD, and each single core was on about 57-58, i kept that going and it lowered to a stable 55-56°C...
it crashed after about a hour and half... but that was strange, i got neither a freeze or a Bsod, one core just failed a test and quit working on prime, while the other kep running at 100% ( still the core was just at lower usage, but working). Can't say if that is a proper crash.

I anyway stopped and tryed IBT, On 10 run of maximum stress i had to stop at the 3 one cause the temps where reaching dagerously the 60°C.
I better try again later with a proper cooler xD.

Anyway thax for your advice smile.gif
post #8 of 35
Quote:
Originally Posted by WhiteEyeTree View Post

No, i was monitoring that with HWMonitor and AOD, and each single core was on about 57-58, i kept that going and it lowered to a stable 55-56°C...
it crashed after about a hour and half... but that was strange, i got neither a freeze or a Bsod, one core just failed a test and quit working on prime, while the other kep running at 100% ( still the core was just at lower usage, but working). Can't say if that is a proper crash.
I anyway stopped and tryed IBT, On 10 run of maximum stress i had to stop at the 3 one cause the temps where reaching dagerously the 60°C.
I better try again later with a proper cooler xD.
Anyway thax for your advice smile.gif

If you really want to seriously overclock i suggest buying a new cpu cooler.
Warning: Spoiler! (Click to show)
This is cooler is expensive, but it's one of the best air coolers on the market. Also double check your case size and RAM height since it is such a large cooler.
post #9 of 35
Quote:
Originally Posted by Imprezzion View Post

The Core temps are NOT physical sensors but they are calculated value's.
Is that documented ? If that , mind providing the link ?
Core temps are bit more accurate value from the diode which is situated on the CPU core/PCB itself rather than a bit far sensor on the Mobo socket.
Quote:
Idle they are usually way off and load they come increasingly close to the real value but it's never accurate.
That quote itself gives you an answer why its different readings as both are different diodes placed on different location. Socket diode/sensor beneath the socket and the other on the processor itself.

Quote:
The CPU temp, or socket temp, is a physical sensor and that's the temp AMD gives as max temp. The max temp for that is 62,7c but usually under stresstests you're fine to about 64-65c
WRONG !! Many mobos shows different values as CPU temp and some are even weird that cannot be compared or taken in to account. So AMD wouldn't risk it saying that the socket temp is the TJ-MAX.

Quote:
Coretemps are usually quite a lot lower then the CU temp as there's 4 cores heating it up and the core temps don't affect eachother since they're calculated value's. For a x4 the core temps are usually 6-8c lower then CPU under full load.
Not here and for many others on this forum. My core temps are 2°C~4°C higher than the socket temp and i never cared to see what Mobo socket diode displays.

Quote:
With a x6 it's usually even 10-12c.
It was well explained and documented that the THUBAN's Core Sensor's were showing awkward results. Can never compare that with its predecessor's as the OP has the 955.
Edited by J.M.D - 2/3/12 at 9:47am
    
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post #10 of 35
Quote:
Originally Posted by WhiteEyeTree View Post

No, i was monitoring that with HWMonitor and AOD, and each single core was on about 57-58, i kept that going and it lowered to a stable 55-56°C...
Nice work. Keep it going. You are really showing your love for your CPU smile.gif
Quote:
it crashed after about a hour and half... but that was strange, i got neither a freeze or a Bsod, one core just failed a test and quit working on prime, while the other kep running at 100% ( still the core was just at lower usage, but working). Can't say if that is a proper crash.
Did it fail on "large FFT's" ???. Well, if so then it can be the CPU itself as it might need an increment in the voltage for it to be stable or might be the heat issue in the worst case. If its "Blend" test, then its related to your RAM or the CPU-NB.

Quote:
I anyway stopped and tryed IBT, On 10 run of maximum stress i had to stop at the 3 one cause the temps where reaching dagerously the 60°C.
IBT sucks for testing real stability. Its only good to get the maximum heat transfer for your CPU/HS.
Quote:
I better try again later with a proper cooler xD.
That's always a better idea !
    
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AMD® Phenom-II x4 955 BE - Lapped | 4.14 GHz Asus M4A79T-Deluxe U3S6 [ 790FX | 10 Phase ] Galaxy GTX 470 [ Core=777 | Mem=1800 ] 8GB G.Skill Ripjaws DDR3 1700 MHz | NB=2800 MHz 
Hard DriveOptical DriveCoolingCooling
OCZ Vertex-4 128 GB SSD + Hitachi 320G HDD + WD... LG-DVD±RAM | P-ATA CPU : T.R.U.E 120 Rev.C [ Lapped ] + Scythe Ult... GPU : Arctic Accelero XTREME Plus + VR003 
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Fans : 5 x Xigma 120mm | X-Silent 140mm | CM 200mm Win 8 Pro-MC - 64bit SAMSUNG SA350 24" LED [ 1080p ] Microsoft SIdeWinder x6 Gaming Keyboard 
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SeaSonic ® S12D-850 Watts [80+ Silver | DC-to-DC] Cooler Master™ - HAF 922 [ Xtreme Modded ] Microsoft Optical Standard ednet 
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SC: Auzen X-Fi™ Prelude + LME49710HA Op-amp SP: Logitech™ Z-5500 Digital 5.1 [ Modded ] FiiO™ E5 Head-Phone Amp + SoundMagic MP-21 in-ear TIM : Cool-Laboratory Liquid Ultra & Tuniq-TX 4 
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AMD® Phenom-II x4 955 BE - Lapped | 4.14 GHz Asus M4A79T-Deluxe U3S6 [ 790FX | 10 Phase ] Galaxy GTX 470 [ Core=777 | Mem=1800 ] 8GB G.Skill Ripjaws DDR3 1700 MHz | NB=2800 MHz 
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Fans : 5 x Xigma 120mm | X-Silent 140mm | CM 200mm Win 8 Pro-MC - 64bit SAMSUNG SA350 24" LED [ 1080p ] Microsoft SIdeWinder x6 Gaming Keyboard 
PowerCaseMouseMouse Pad
SeaSonic ® S12D-850 Watts [80+ Silver | DC-to-DC] Cooler Master™ - HAF 922 [ Xtreme Modded ] Microsoft Optical Standard ednet 
AudioAudioAudioOther
SC: Auzen X-Fi™ Prelude + LME49710HA Op-amp SP: Logitech™ Z-5500 Digital 5.1 [ Modded ] FiiO™ E5 Head-Phone Amp + SoundMagic MP-21 in-ear TIM : Cool-Laboratory Liquid Ultra & Tuniq-TX 4 
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