Overheating CPU - i5 2500k - water cooled - high 90s!

Robbolo

Commendable
Nov 19, 2016
2
0
1,510
Hello friends,

I am having problems with an overheating CPU that's hitting high 90s when stressed and sits in mid-70s as I type this. CPU temps were gained using HWinfo and BIOS.

Sys info:
CPU: i5 2500k /w water cooler (looks like Corsair H60 but not 100% sure)
GPU: R9 290X
RAM 16GB
PSU: 750W
Mobo: ASRock Z68 Extreme4 Gen3

A few things of note:

-The CPU is watercooled by a sealed unit that looks like a Corsair H60. The rest of the rig is not running hot so I don't think it's an airflow issue. (GPU sitting 40s)

-I've reseated and reapplied thermal paste to CPU twice already (including cleaning fan/heatsinks) - this doesn't seem to have made a massive difference and I'm less likely to believe this is the main cause.

-The water unit sitting on the CPU feels hot to the touch after use, but the tubes do not - I'm not sure if the tube plastic is thicker and I wouldn't be able to feel this anyway, or if it's a symptom that the cooler isn't working properly. The CPU fan - that the pump unit is plugged into is reading over 4000 RPM which indicates the pump is working properly I think?


Is there anything I can do to check the functioning of the water cooler? Is it likely that I've botched the thermal paste application twice? Is the CPU dying? What can I do to check this?

Hope these questions make sense and I've given you enough info to help.

Many thanks,

Rob
 
Unlikely to be thermal paste twice unless you added way to much or to little. If pump RPM is good, I'd check the mounting mechanism. Possible for some reason it's not making good contact with CPU. Another possibility, though unlinkely, would be a pinhole in cooling system where some coolant has evaporated. However, this should lead to pump failure.
 

Robbolo

Commendable
Nov 19, 2016
2
0
1,510


With regards to the cooler mounting - the water unit (or whatever it is that sits directly on CPU) is hot to the touch - I'd assume this means there's decent contact as there seems to be heat transference from CPU to water unit. The tubes however, are quite cool and not even warm - which I'm not sure is something to worry about. Would you expect to be able to feel some heat in the tubes?