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WTH?. is this Thermal Throttling?

post #1 of 12
Thread Starter 
Hi guys.

I'm slightly confused about some wierd behaviour that ive noticed CPU-Z has been reporting..

Ive had umbra below, overclocked to 3.6Ghz (or so i thought) for some time....but while running Prime95 i noticed that CPU-Z reported that my multiplier had been reduced to x6 (from x9 - therefore reducing my overclock) it would then hold it there for a good minute or so, and only return to the overclocked state for 10 or so seconds at most.

Now, i immediately thought this was thermal throttling. yet PCProbe reports a reasonable temperature of 61C (and yes, that is including +15C that PCProbe tends to be out)

I suspect that this is because my water cooling loop isn't quick enough to remove the heat from the CPU's IHS, yet the CPU's Thermal Throttling notices this sudden spike in high temps (albeit brief, perhaps miliseconds) and brings the overclock down in defence.

Sinse i noticed this behavior, i decided to bring my overclock RIGHT down, to 3.3Ghz. now i find that this is much rare occurance, and my 3.3Ghz OC is sustained almost indefinitely

However, i also run a GPU in my water cooling loop (2900xt 1GB, also OC) seeing as Prime95 stresses only the CPU, i'd likely have to bring my OC down further, to say 3.2Ghz (along with voltages obviously) if i want my CPU overclock to be maintained perminently while gaming, or other apps that are both GPU & CPU intensive

Here's a couple of images of this happening on my 3.3GHz overclock:

CPU in overclocked state (3.3GHz):


And CPU-Z showing it being briefly reduced:




Anyway, if somebody with more experience could please explain this to me it would be hugely appreciated....i expect i'm miles off .

+rep given where its due. thanks alot
post #2 of 12
Turn off C1E and Speedstep. That would fix it

Edit: I just noticed your motherboard. Intel Speedstep might be called something else. C1E is definitely in there, turn it off.

My Q6600 throttles at 84C.
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post #3 of 12
Have you disabled C1E and speedstep in the BIOS? They automatically lower the multi at idle to reduce temps.

It's unlikely to be thermal throttling. Intel's thermal spec says the limit is 70, and this random post says it'll start throttling at 80. http://www.overclock.net/intel-cpus/...ml#post1542172
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post #4 of 12
Throttling occurs at a very high temperature ~100C I believe. It is a last ditch effort to cool down the cpu before automatically shutting down the system. Check your temps with core temp.
post #5 of 12
Whats your rad? Curious

Remember even though its throttled mhz wise the vcore you put through it is still there..so that can be a reason for the high temps.

Try turning off all throttling options in the bios. Speedstep (EIST) and C1E are two popular names for these options. If the temps stay at 61c, no worries, right?
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post #6 of 12
Thread Starter 
Well, my BIOS automatically disabled intel speedstep when you manually enter a CPU ratio (in my case, reducing it from auto, to x9 )

i'll check the BIOS over for C1E - its something ive never heard of before .

But if what you say is true, and both these adjust cpu ratio when its at idle/load, then surely it should stay maxed throughout the entire Prime95 tests? :\\

anyway, +Rep for you all. good suggestions

Quote:
Originally Posted by Kopi View Post
Whats your rad? Curious
Thermochill PA120.2 if i remember right. with new 107CFM (x2) fans added
post #7 of 12
Quote:
Originally Posted by Thingamajig View Post
But if what you say is true, and both these adjust cpu ratio when its at idle/load, then surely it should stay maxed throughout the entire Prime95 tests? :
Yep. It will remain at the max multiplier when under load.

http://en.wikipedia.org/wiki/SpeedStep
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post #8 of 12
Thread Starter 
Well i checked my BIOS for C1E and i found such a setting...so i disabled it.

Yet my overclock is STILL undone when my CPU has been under load for some time, its just now its no so frequent....(and its only undone when the processor gets hot)

Anyone got any more ideas?
post #9 of 12
What kind of rad are you using? Fans on the rad? Also, try using a different program than PCProbe to monitor the temps, like CoreTemp or Everest
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by TheNix View Post
What kind of rad are you using? Fans on the rad? Also, try using a different program than PCProbe to monitor the temps, like CoreTemp or Everest
I don't use coretemp as i must disable driver signing for it to work. with constant restarts it just got troublesome so i just done bother.

i found that adding +15°C to the results is more than enough to compensate

i left Prime95 running all night last night to test my 3.4GHz overclock. when i awoke this morning i saw that temps had reached 70°C, and my multiplier was being reduced quite often to x6. ( was running large FFT's)

i'm running a Thermochill PA120.2 radiator. with 107CFM fans (check my 2nd post above )
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