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Overclocked Phenom II x6 crashes after 15-20 min. P95

post #1 of 11
Thread Starter 
I've been trying to overclock my Phenom II 1045t x6 and at 3.8 GHz, I need to set the Vcore higher than 1.475 V to counter act Vdroop and be stable. I didn't feel comfortable upping the Vcore past that as it would idle above the recommended max voltage, I dropped the voltage down and turned on LLC. Now it idles at 1.392 Vcore and jumps up to 1.404-1.462 Vcore when stressed. It seemed fairly stable and survives P95 very easily for the first 15 minutes... mad.gif Until this happened:

I was monitoring my computer through teamviewer when it shut off, so I took a picture of the final image it sent. It seems like the LLC just wasn't able to keep up and the Vcore dropped down to 1.344 so it crashed... Any ideas on where I should go from here?
post #2 of 11
Hi. this guide will help you out.
You can bump the voltage up to 1.5v, set LLC off. Just a question on your mobo. Is it rev 3.1 or 4.1? The difference is that rev 3.1 has no heatsink on the VRM area, and you'll need a fan blowing air to keep it cool. A 4+1 power phase is ok, but just that.
   
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post #3 of 11
Quote:
Originally Posted by Kourin View Post

I've been trying to overclock my Phenom II 1045t x6 and at 3.8 GHz, I need to set the Vcore higher than 1.475 V to counter act Vdroop and be stable. I didn't feel comfortable upping the Vcore past that as it would idle above the recommended max voltage, I dropped the voltage down and turned on LLC. Now it idles at 1.392 Vcore and jumps up to 1.404-1.462 Vcore when stressed. It seemed fairly stable and survives P95 very easily for the first 15 minutes... mad.gif Until this happened:

I was monitoring my computer through teamviewer when it shut off, so I took a picture of the final image it sent. It seems like the LLC just wasn't able to keep up and the Vcore dropped down to 1.344 so it crashed... Any ideas on where I should go from here?

I'm guessing something got hot and the voltage dropped because of it, possibly due to throttling. Did you happen to be monitoring clockspeeds as well?

EDIT: It seems it was throttling, look at the CPU-Z , not enough mhz
Edited by cssorkinman - 5/12/13 at 7:38am
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post #4 of 11
Thread Starter 
Thanks for the replies, and yes, my VRMs are heatsinked (Rev 4.1).

I didn't even notice the drop in Clockspeed, but I'm surprised that that would be caused by heat, as my CPU Temp (TMPIN2) peaked at 57C and stayed at about 53-55 most of the time. I have since changed LLC to Extreme from Auto and am running P95 again to see if it still happens. According to AMD, my processor is rated up to 71C Tcase. Both my CPU and Core temps are well below that limit.

Edit: Grmadness, on the guide you linked to, it says the max safe Voltage Thuban is good for is 1.475V. Do you still recommend going to 1.5V despite this?
Edited by Kourin - 5/12/13 at 9:25am
post #5 of 11
1.55v is recommended by AMD. The guide recommends 1.475v to keep it safe. 1.5v is my absolute max as a suggestion. At 50-55*C the chip starts to become unstable (if you are stable while stress testing at these temps,you are golden), at 62*C it starts to throttle to protect itself. Thanx for pointing that out. thumb.gif
Edited by Grmadness - 5/12/13 at 9:47am
   
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post #6 of 11
Thread Starter 
I lowered the overclock a bit, and it seems like I don't have the throttling issue so long as I keep CPU temps under 55C. I'll see what I can do about improving my cooling (I'm not entirely sure whether I applied enough thermal paste with my Hyper 212 EVO). I can boot to 4.05 GHz, but anything higher than 3.75GHz is too hot to stay stable...

Thanks for the help! thumb.gif
post #7 of 11
If your CPU temps go above 55C, you will find some sort of instability, just use that as a reference.
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post #8 of 11
Quote:
Originally Posted by Kourin View Post

I lowered the overclock a bit, and it seems like I don't have the throttling issue so long as I keep CPU temps under 55C. I'll see what I can do about improving my cooling (I'm not entirely sure whether I applied enough thermal paste with my Hyper 212 EVO). I can boot to 4.05 GHz, but anything higher than 3.75GHz is too hot to stay stable...

Thanks for the help! thumb.gif

Just make sure that you don't use too much thermal paste. A pea size dot in the center of the heatspreader will be enough. thumb.gif
   
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post #9 of 11
Thread Starter 
I definitely used enough, I'm just not sure it spread evenly due to the Hyper 212 EVO's unique fastening mechanism. I can see thermal paste just barely seeping out from 3 of the sides, but the fourth side has no paste showing. Not sure if that is good or bad and whether it would be worth it to unscrew and reset the heatsink to check if the paste is spread enough. I used the Antec Formula 7 Nano Diamond thermal paste by the way.
post #10 of 11
It has to spread in the center, that's where the cores are... And maybe you used too much? that would not be good for the temps... Just rub it off with a cotton swab and some isopropyl alcohol, reapply, and let the heatsink of the cooler do the spread... thumb.gif
   
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Hitachi 80 Gb Plextor CD-DVD RW  What was that again? Windows 98 SE  
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15'' CRT Broken Yes,it has. Fridge 
MouseMouse PadAudio
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