CPU Quickly overheating

[NeoVidia]

I recently merged an old setup to create cheap media server.
However after merging the parts it seems to overheat in the CPU in an instant. This was not the case before the merge and the CPU ran great.

I checked out to see if it was the cooling. Eventhough it feels like overkill to cool it with an Corsair Hydro h80. It does not seem to be able to cool it down fast enough. I checked every heatsink, re-aply'd thermal paste, and it still overheats in a few minutes.

Thought it might have been a BIOS setting but even at stock settings it still overheats in a few minutes.

Some system info:
CPU Idle temp: 85-100c before shutting down.
GPU temp: 30c

Motherboard: Rampage Extreme III
CPU: i7 920 2.66ghz (running at stock speed)
CPU Cooler: Corsair Hydro H80
PSU: Cooler Master Silent Pro 600W
GPU: Nvidia GT 440
Memory: 2x Kingston 8gb 1033

 

[synphul]

The h80 isn't the most powerful cooler around but it should be more than enough to cool that i7 at stock speed. Have you felt the tubing to make sure both water lines are warm (checking for circulation)? Can you hear or feel the pump running? I would try to reseat the cooler again and check it carefully or try a different cooler in case there's something faulty with the h80. It definitely shouldn't be 85-100c at idle.

 

[NeoVidia]

Im gonna buy and try a new cooler, might indeed be something wrong with it then. Will reopen when I get the results

 

[CompuTronix]

Hi synphul,

I just wanted to pop in for a moment and mention for perspective, the I7 920 is a 130 watt processor.

Keep up the good work. It is much appreciated!

CT

 

[synphul]

Right, I know it's a fair bit higher on the tdp rating but that still seems pretty warm. Aren't the tcase temps in the intel specs the listed thermal limits for the ihs? The 920's tcase is a bit lower than newer i7's like the 4790k - 67.9c vs 74c for the newer i7's. If I had to guess it has something to do with the larger die size with the higher tdp and the newer smaller die with lower tdp factoring in tech revisions that allow for slightly higher tcase values.

I was just factoring that an h80 likely cools at least as good as (if not better) than the stock cooler. I'm not as familiar with liquid coolers, most air coolers give a thermal design to try and help match them up such as a tdp rating of 180w for the hyper 212 evo. Couldn't find any such info for the h80, at least not from a quick glance and newegg's spec sheet or from the corsair website. Tcase temps always kind of threw me off since it factors the heat at the ihs and not necessarily the core and I'm never certain if the sensor related temps for cores are based off true core or tcase temps. (Assuming true core temps to be slightly higher since they're at the source, but aren't specified on ark).

 

[CompuTronix]

Allow me to give you a refresh:

Intel desktop processors have thermal sensors for each Core, plus a sensor for the entire processor, so a Quad Core has five sensors. Heat originates within the Cores where Digital sensors measure Core temperatures. A single Analog sensor under the Cores measures overall CPU temperature.

Core temperature is 5C higher than CPU temperature due to sensor location. Intel's Thermal Specification is "Tcase", which is CPU temperature, not Core Temperature. Tcase for the i7 920 is 67C. Tcase + 5 makes the corresponding Core temperature 72C.

The relationship between Core temperature and CPU temperature is not in the Thermal Specifications; it's only found in a few engineering documents.

The relationships between Ambient temperature, CPU temperatures, Core temperatures and Throttle temperatures are shown below for the i7 920. All values are based on Intel documentation.

Core i 1st Generation 45 Nanometer: i7 920 D0 (TDP 130W / Idle 12W)

Standard Ambient = 22C
Tcase (CPU temp) = 67C
CPU / Core offset + 5C
Tjunction (Core temp) = 72C
Tj Max (Throttle temp) = 100C

CT

 

[synphul]

Thanks CT, I thought the cores were a tad higher. I also wasn't sure of the max temps for the 920 but that explains the op's shutdowns. The stock cooler should keep it within operating temps and just about (not always) any decent aftermarket cooler should equal or perform better than stock. Doubt it was too much thermal paste, would have to be a lot of thermal paste. After multiple installs of the cooler I'd think it would eliminate mounting issues in case something didn't go quite right and without knowing the age of the cooler itself it may be failing or the pump growing weak to the point it just can't eliminate the heat. As quickly as I see temps move on cpu's with different variations, a few minutes sounds like a slow/weak or stalled pump, even a halfways slow pump i'd think would overheat more gradually.

Only assuming since it's an h80 that's it a bit older of a unit (the h80i's have been out for awhile). It may have given up the ghost.