Cpu Temp Issues with i7-6800k

goodwin.8320

Honorable
Sep 23, 2017
2
0
10,510
Hello!

Below are the specs of my build:

CPU: Intel - Core i7-6800K 3.4GHz 6-Core Processor
Cooler: Corsair - H105 73.0 CFM Liquid CPU Cooler (Arctic Silver - 5 High-Density Polysynthetic Silver 3.5g Thermal Paste Used)
Motherboard: Asus - X99-DELUXE II ATX LGA2011-3 Motherboard
Ram: Corsair - Dominator Platinum 16GB (2 x 8GB) DDR4-3000 Memory
Harddrive: Samsung - 850 EVO-Series 1TB 2.5" Solid State Drive
GPU: Asus - GeForce GTX 1070 8GB Video Card
Power Supply: Corsair - RMx 850W 80+ Gold Certified Fully-Modular ATX Power Supply

My issue is with my cpu temperature. As I write this my idle temp is around 50C - 60C. When I boot, I see a spike of temps of 85+ (Cam software like to tell me this / also look at Core Temp Software) or even 90C, but it will calm down to a reasonable temp after about ~15 seconds. When I attempted to do a 15 min Real Bench test, I immediately hit temps of 100C so I stopped after ~10 seconds.

I applied the thermal paste myself using the rice method after cleaning off the stock thermal paste with isopropyl alcohol and letting it dry thoroughly. The bios is set at default.

Those temp numbers are not good correct? I summe I should be able to run a full 15 min test without hitting 100C (from what I have read some people do not even hit 80C throughout the test, yet I hit that temp with ease).

I assume I should try and redue the thermal paste first?

If that is no improvement, is it most likely a default in the cooler or cpu or is it a setting issue?

Thank you for any help!

 
Solution
Brand new AIO units can certainly arrive with faulty pumps. Just like any new appliance or electronics device, since the occurrence of DOA / defective new parts is unfortunately as high as 10%, so this happens all too often.

Unless you've overlooked an obvious installation / mounting issue where the pump / waterblock isn't snuggly secured against the CPU using the correct length standoffs for socket 2011, or the fans are running but you didn't connect the pump, a faulty pump is the most likely scenario.

CompuTronix

Intel Master
Moderator
goodwin.8320,

On behalf of Tom's Moderator Team, welcome aboard!

Your i7 6800K is a 6 Core / 12 Thread 140 Watt TDP processor which has a soldered Integrated Heat Spreader (IHS). Since you're running at stock settings with a 240mm H105, although you haven't mentioned your ambient (room) temperature, your high temperature problem is likely due to a classic pump failure.

This is a common occurrence frequently seen on computer technology Forums, especially involving All In One (AIO) coolers, and particularly for people who like to leave their computers running 24/7/365.

Regardless of whether you use an AIO or custom loop, pumps fail. It's not a question of if ... it's a question of when. Since pumps, fans and hard drives all have mechanical moving parts, they're all subject to failure. AIO pumps are especially most prone to failure, since they don't have better Meant Time Before Failure (MTBF) hour ratings such as higher quality pumps used in custom loops.

Even during an extended stress test, both cooling tubes should feel only warm with a moderate temperature differential. If one tube is noticeably hot at the pump / waterblock unit, it typically indicates poor flow, blockage or pump head failure, even if you can hear the pump motor running.

If you have an air cooler that you can mount temporarily to troubleshoot the problem, you can quickly prove the AIO has failed. Hopefully you'll be able to RMA your H105 and receive a replacement, since Corsair provides a 5 year warranty.

Once again, welcome aboard!

CT :sol:
 

goodwin.8320

Honorable
Sep 23, 2017
2
0
10,510
Thank you for the quick and awesome response!

I did forget to mention that this is a very new build. As in been running less than ~20 hours I would say.

Would your pump failure hypothesis still stand with this new knowledge?

I would also mention that the room temp is hot; probably pushing 80F (3rd floor in brooklyn with no ac!).

Thank you again for your help
 

CompuTronix

Intel Master
Moderator
Brand new AIO units can certainly arrive with faulty pumps. Just like any new appliance or electronics device, since the occurrence of DOA / defective new parts is unfortunately as high as 10%, so this happens all too often.

Unless you've overlooked an obvious installation / mounting issue where the pump / waterblock isn't snuggly secured against the CPU using the correct length standoffs for socket 2011, or the fans are running but you didn't connect the pump, a faulty pump is the most likely scenario.
 
Solution