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i7-5820k Large Core Temp Delta?

D

dxun1

n00b
Joined
Aug 8, 2014
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21
I've been monitoring the CPU core temperatures last few days and I am a little bit concerned with core deltas so I would ask for your advice/thoughts - I am not sure if I should reapply the TIM (used MX-4).

I am running a 5820k@stock on Sabertooth X99 and Prolimatech Megahalems cooler in Fractal Design S chassis. The heatsink is paired up with a 140/120 mm pair of fans together with 4 Fractal Design's GP-14 140 mm fans so there should be ample airflow.



I am using Prime95, calibrated RealTempGT 3.7 and Asus AI Suite for temperature monitoring. Here are the results (temps are measured with all fans at full speed):
- Small FFT -> RealTemp core temps 62-70 C (AI suite reports CPU temp of 55 C)
- Blend -> RealTemp core temps 52-62 C (AI suite reports CPU temp of 51 C)
It is always the same core spiking in temp and heating its neighbour.
Idle temps are high 20ies - ambient 19-21 C.

As I had always done before, I've cleaned both CPU IHS and heatsink surfaces with 70% isopropyl, used the 'credit card method' to apply the TIM to heatsink, spreading it as evenly and thinnly as I could. After cleaning the heatsink I used a plastic glove to "rub in" TIM onto the contact surface (so as to fill in the microgaps as best as possible).







The question is - is this delta normal or should I reapply the TIM? I've been told core temps delta should be no higher than 3 C but then again I came across an official mail from Intel to a customer saying the core temp measurement is not officially supported - so I am confused; what should I hunt for?
 
its completely normal as is....if your worried about some of the cores with huge temp differences...Don't worry about it....its normal even on 1366 Xeons .....i get almost 10 deg differences almost all the time......btw you should probably pm a mod to delete the other thread...nice setup btw...it almost looks like the case is over sized with all that open area lol... has plenty of room for water cooling at least:)
 
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I am worried mostly about air bubbles in TIM - which is what I hear can happen when you use credit card to apply the TIM to IHS. OTOH, I would hate to ruin a perfectly good seal between IHS and heatsink unless it's really worthwhile.

I am also a little bit worried about the idle temps - it's an 8 degree rise over ambient, and this is a decent cooler. Don't you think it is a little bit on the high side? Come to think of it, hitting 70 C on stock and on a single core with prime 95......that also seems a bit high.

Yes, Define S is like that (open and spacious) - I am a sucker for silence so I wanted good airflow and sound damping all in one case. This fit the bill perfectly.

Thanks for the heads-up, I already notified the mod.
 
Load temps sound normal to me. An 8C delta at idle is a bit high, I only have a 2-3C delta at idle from the hottest to coolest core.

Are you sure there's no single threaded app running in the background at idle?
 
Absolutely sure - tested it more than a few times.

Surely, the TIM couldn't have expired - it's been three years but it was always firmly closed and wrapped in a sealed plastic bag.
 
Load temps look pretty close to normal to me.

As far as idle temps go ~ are you using c-states in the bios or are they all off? Idle temps can seem at bit wacky if there is something running in the background that is increasing clockspeed and voltages briefly.... task manager isn't going to show you all the processes that may be running. Process explorer works pretty well for flushing em out.


And IMO, (i've probably installed 200 plus heatsink/cpu's over the years) the credit card method has always been inconsistent for me as compared with the grain o' rice technique.


It is entirely possible that the TIM may have been affected by time or fallen out of suspension. Closed and in a plastic bag is in no way airtight :)

But honestly you are probably just fine.


*edit* need to get yourself some 90+ % alcohol instead of that walmart 70 you are using ;)

**edit x2** Also might want to check the fan headers you have the cpu fans on to make sure they are not being adjusted by the bios.
 
Hitting the 50s C is just how it works. Electricity dissipates heat.

The 3 degree value might mean while idling. Under load though you're going to get into the 50s and probably even high 60s. The original xbox's ran around 65-75 iirc. You don't have to worry much until you're hitting the 90s imo.
 
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