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Phenom II 955, NH-U12P, Cooling Performance Questions

post #1 of 9
Thread Starter 
Hi Guys,

I have a Phenom II 955 BE currently clocked at 3.8Ghz @ 1.475v with a Noctua NH-U12P SE heatsink and a Thermalright TY-140. The Cpu-NB voltage is at 1.325v. I've run Prime 95 overnight and it's stable. What i'm not too sure about is whether it is running a bit hot.

Cool and Quiet is disabled because the CPU multiplier is over 18x.
For load temps I've used Prime 95 for about 15mins.
With an ambient temperature of 23° I'm getting:

Idle: 37° (Core: 44°)
Load: 59° (Core: 65°)

I've been looking around on the net and I keep seeing people with the same voltages and clocks (or higher clocks!), yet the temperatures they're posting are much lower than mine! Mind you, they often don't mention the ambient temperature or what they're using to load the CPU.

How are my temps going in your opinion? Unusually high? Perhaps I should re-apply the heatsink? Halps!
post #2 of 9
Hey mate, welcome to OCN.

As I see it 60°C isn't quite that much considering I'm at about 50°C @3.2 and undervolted albeit with a lower grade HSF.

Your temps could be higher vs other's results for a couple of reasons:
*different ambient temp as you pointed out
*what matters much more: different case temp - that's the "ambient" for the cooler
*TIM / placement of the HSF

Bottom line: I think your temps are normal, the variance of a few °C could come from different case airflow or air temperature or from a better CPU batch. No need to reapply the heatsink, but since it's not such a hard job you could remove it and see if the thermal paste is evenly spread on the surface of the CPU.
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post #3 of 9
Thread Starter 
Thanks for the welcome biggrin.gif as you can see, i've just been lurking for 5 years, nothing unusual right?!

Well, I redid the thermal paste, and made it slightly worse. 62° under load now! I presume that's because it's no longer broken in.. At least I know that was reasonable. The coverage was a slightly patchy, so I made sure to stick a little extra on this time. I've probably got too much now lol. We'll see.

Case temps, according to the 'System' temp reported from the motherboard are at 41° Idle. Seems quite warm to me.. Should this be lower?

I've attached this amazing image of my computer to illustrate the Cpu's working environment! Looks messy.. Probably because it is.

EDIT: I should probably mention that, despite the mess, the temps aren't lower with the side panel off, or atleast only by 1°.
Edited by psycho_steve - 10/11/11 at 8:24am
post #4 of 9
Ignore idle temps, but the fact is that you are indeed running very hot. The recommended limit for your CPU is 62C "Core Temp" and not 60C for extended periods. If your ambients are very high, then you need to back down your overclock till it gets cooler or you get better cooling. Also keep in mind that you only need a small amount of thermal paste the size of a pea.
Edited by ALUCARDVPR - 10/11/11 at 10:42am
post #5 of 9
drop your vcore to 1.45v.. test it overnight again ...
    
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post #6 of 9
Thread Starter 
Thanks for the advice guys!

I reattached the heat sink again with a slightly smaller amount than before. Didn't feel good about it lol, but I think i've done a better job this time. Now it's going at Core: 63° CPU: 57° under prime95 load after 20 minutes. However the ambient temp is 21.6° this morning. Also I realise the voltage is 1.5v, not 1.475. Cpu-Z shows 1.488, Everest 1.475, but in the bios it is +150mv so 1.35 + 0.150 would be 1.5v

@Yuksell
Unfortunately at 1.45v it crashes within 5mins, at 1.475 it crashes after about an hour or two. 1.5v it's stable for 10hours.

@ALUCARDVPR
According to your advice I'm happily destroying my processor here! Whoops! I read your guide. It seems to be in direct contradiction of the advice that I found over here:

http://www.overclock.net/amd-cpus/663718-maximum-safe-phenom-ii-955-965-a.html#post8402330

They reckon'd it was the CPU temp and not the core temp that I should be watching, with support from an AMD dude! I just have no idea anymore lol!

I guess I might have to back it off?
post #7 of 9
Try to adjust the fsb and lower your multiplier to see if it can stable using a lower voltage?

My 955 BE run 3.9GHz with 19.5x under 1.375v, and now I'm using 3.91Ghz with 230*17 and 1.4v, tested with prime95 and no error, ambient temp 24'c and full load 56'c

I'll say 1.5v is a little bit high for daily use, it increased your CPU temp too.frown.gif
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post #8 of 9
try to resink your Noctua im running 4.4ghz on a hyper 212+ and my Temps are nowhere near that high
post #9 of 9
Thread Starter 
@Digiko
Good idea! Thanks! Totally forgot about adjusting the ol multiplier, I'll definitely give that a shot. Not sure if my CPU will work out quite as well as yours, It's an older one. Stepping 2, Revision RB-C2. Anyway, definitely worth trying.

Also, seems like i'm getting comparable temperatures to you under load, remembering I've got 1.5v atm, meaning there's not much to worry about heat sink setup wise. Thanks for posting your ambients and load method, helps alot biggrin.gif!

EDIT: Well i did some messing around, reducing voltages on a lower multiplier with increased FSB and ended up with 3.8Ghz @ 1.424v (Or +100mv) and it seems to be stable so far! 17.5x multiplier making 3880Mhz caused crashes, so I decided to settle for 3.8Ghz at 1.424v. Of course, I had to lower the memory divider, so that's now at 1493Mhz 7-7-7-24-28 rather than 1600mhz that I had before. I could rejig the fsb to get this back on 1600mhz, but since it doesn't really do much for performance.. I'd rather have CnQ enabled. (To achieve 1600mhz I have to increase the CPU-NB voltage to 1.325, which disables CnQ. I was ok about this before because the multiplier was disabling CnQ anyways...)

At the moment it's at 59°-60° After an hour of Prime95 with ambient temps of 25° (It's a bit warmer today smile.gif ). Considering I play games which come nothing close to taxing the cpu like prime95, I'm content with how things are goin. Thanks for your help guys!
Edited by psycho_steve - 10/13/11 at 12:21am
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