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Prime95 Help

post #1 of 11
Thread Starter 
Hello everyone,

I have recently been attempting to overclock my 1055T to 3.8Ghz on my M5A97 EVO motherboard. I have been using Prime95 (Small FFTs) to test the stability of my overclock at different voltages. I was aiming to run it for 20 minutes to give me a quick indication of whether or not the overclock was stable.

Here are the results of the tests I have tried so far (note I am increasing the CPU voltage by one step each time, the minimum step on my motherboard is 0.625V):

CPU Voltage |Result
------------------------------------------------
1.4V |Failed - Computer froze
1.40625V |Failed - Computer shut down after about 2 minutes (got to 2nd test)
1.4125V |Failed - Computer shut down after about 2.5 minutes (got to 2nd test)
1.41875V |Failed - Computer shut down after about 3 minutes (got to 3rd test)
1.425V |Failed - Computer shut down after about 3 minutes (got to 3rd test)
1.43125V |Failed - Computer shut down after about 3 minutes (got to 3rd test)

After 1.43125V, I gave up and decided to post this thread. Throughout the short duration of each test, I was monitoring my system temperatures with HWMonitor. The highest temperature I ever saw any of my CPU cores reach was around 59C. Referring to the attached image, these readings are under the heading 'AMD Phenom II X6 1055T'. However, the 'CPU' reading under the heading 'Temperatures' reached as high as 75C.

Throughout every test I disabled the CPU fan auto speed in the BIOS, meaning the CPU fan was running at 100% speed. I have 1 case fan at the back of my case for air exhaust, also running at full speed. I left the side panel off for all the tests.

The CPU temperatures in the attached image are my temps at idle with 100% CPU fan.

Another thing is that when I had the CPU voltage set to 1.425V in the BIOS, I opened CPU-Z during the Prime95 test and it reported that the CPU voltage was at 1.47V. Is this due to CPU LLC being on? And if so why is the voltage so much higher than what I set in the BIOS?

But my main question is, what is causing my shutdowns, lack of voltage or high temps? I have seen many people achieving overclocks to my level with much less voltage than the highest voltage that I tested, so I'm starting to think that it's a temp issue. Does Prime95 cause your computer to shut down if there isn't sufficient voltage, or is that because of high temps?

Also in case you didn't look at my sig I'm running a CM Hyper 212+ with one fan.

If you actually bothered to read all this and answer, thanks for your time!

Edited by Mr. Moon - 10/21/11 at 2:47am
    
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1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
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1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
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post #2 of 11
1. The functional operation limits for your 1055T are 1.40v & 62°C.

2. If everything is set back to completely stock in BIOS, can you pass Prime without issue?
post #3 of 11
Thread Starter 
Quote:
Originally Posted by jlells01 View Post
1. The functional operation limits for your 1055T are 1.40v & 62°C.

2. If everything is set back to completely stock in BIOS, can you pass Prime without issue?
If you have a look at this: http://www.overclock.net/amd-cpus/72...ners-club.html, then you will see that there are MANY people running these CPUs at higher than 1.4V. That figure is just the maximum CPU voltage specified by AMD to avoid decreasing the life of the CPU by a significant amount, it's not the 'operational limit'. As for 62C, well I'm below that aren't I?

As for stock, I'll try that and see what happens.
    
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1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
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CPUMotherboardGraphicsRAM
1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
Hard DriveCoolingOSMonitor
1.5TB Samsung + 2x 1TB WD Caviar Blue Hyper 212+ Windows 7 Professional 64-bit 21.5" Samsung 1920x1080 
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post #4 of 11
Quote:
Originally Posted by Mr. Moon View Post
it's not the 'operational limit'
My exact wording was "functional operation limit", and its exactly that. Can you run higher? Absolutely. Expect degradation and long-term reliability to suffer.

You've obviously got it all figured out; good luck.
post #5 of 11
Thread Starter 
Just ran a 20 minute test on stock, it was fine. I'm still confused though, are my temps the issue or is it my voltages? That's what I want to know.
    
CPUMotherboardGraphicsRAM
1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
Hard DriveCoolingOSMonitor
1.5TB Samsung + 2x 1TB WD Caviar Blue Hyper 212+ Windows 7 Professional 64-bit 21.5" Samsung 1920x1080 
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Razer Lycosa Corsair HX650 Thermaltake V3 Black Edition Razer Deathadder 
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CPUMotherboardGraphicsRAM
1055T [3.82Ghz @ 1.4v] Asus M5A97 EVO [NB - 2.45Ghz @ 1.275v] MSI GTX 570 Twin Frozr II @ 850core 2000mem 1.05v G.Skill Ripjaws 8GB [1450Mhz 9-9-9-24-2T (CBF t... 
Hard DriveCoolingOSMonitor
1.5TB Samsung + 2x 1TB WD Caviar Blue Hyper 212+ Windows 7 Professional 64-bit 21.5" Samsung 1920x1080 
KeyboardPowerCaseMouse
Razer Lycosa Corsair HX650 Thermaltake V3 Black Edition Razer Deathadder 
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post #6 of 11
your temps sound high tbh
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post #7 of 11
This may be far-fetched but have you observed if the shutdown happens always at the same temperature? I was just thinking if you have some (possibly configurable) thermal safety measure in BIOS that forces a shutdown when the CPU or the board itself reaches a given temperature threshold? I skimmed through the PDF-manual for your board but didn't find anything obvious so this may also be just a wild goose chase.
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post #8 of 11
Quote:
Originally Posted by jlells01 View Post
My exact wording was "functional operation limit", and its exactly that. Can you run higher? Absolutely. Expect degradation and long-term reliability to suffer.

You've obviously got it all figured out; good luck.

OP isn't asking about long-term reliability; "functional operational limit" is not relevant. Breathe deep, unclench, and relax.
post #9 of 11
Quote:
Originally Posted by flyingsaucers View Post
OP isn't asking about long-term reliability; "functional operational limit" is not relevant. Breathe deep, unclench, and relax.
He asked about voltages and temperatures; I gave him the data directly from AMD.

Why don't you help him out? Oh, wait...you'd have to contribute something of any worth whatsoever to a thread, and it's rather obvious that's not what you're here for.

Hopefully this'll bounce the thread back to the top, and someone will be willing to give some time and assist Mr. Moon.
Edited by jlells01 - 10/21/11 at 3:56pm
post #10 of 11
just so you know having the side panel off doesn't mean it will get better cooling as the fans intaking air are just wasting power and are not creating high pressure within the system i recomend putting your side panel on and increasing your multplier by incriments of 0.5 and running prime95 for at least an hour the if its ok increase it again then when it begins to fail start raising the core voltage slowly so's not to over volt it as to many volts are just as bad as not enough. also i would recomend a new cpu cooler as running prime95 for hours on end on any proccesor at over 55 degrees celcius can dramasticly shorten the cpu's lifespan hope this helps you
    
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