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Hot CPU temperatures on first water cooled build?

post #1 of 9
Thread Starter 
I have just finished up the build after bleeding it for about 10 hours. I am using a i7 2600k @4.2Ghz and ~1.25V and a MSI GTX 1080 SEAHAWK EK X.
When idle, the CPU temp jumps between 35 and 42C, the GPU stays at 32C.
During prime95 with 90% memory used and 1344 FFT the max temps were 56C on the hottest core. Seen here: http://i.imgur.com/hUgWxmJ.png
Using intel burn test the max temps were 62C on the hottest core. Seen here: http://i.imgur.com/zwqpWBr.png
The max temp on the GPU was 43C after running heaven benchmark for about 20 minutes which I am happy with.

I'm wondering if these CPU temps are normal? The CPU cooler I had before the custom loop was the Corsair H100i and gave me about the same temperatures, especially the idle temps so maybe I was just expecting too much? Sorry if this is a stupid post and everything is fine but I really don't have any experience with custom loops.


The other parts are:
13/19mm soft tube with corresponding EK ACF fittings
EK SE 360 radiator (Top exhaust, pull)
EK SE 240 radiator (Front intake, pull)
EK XRES 140 with D5 pump PWM (Running 80% during benchmark)
EK Supremacy Acetal
Radiator fans are 5 Noctua NF-F12 120mm (Running at 1200rpm during benchmark)

The whole build can be seen here: http://i.imgur.com/OA4Ldpr.jpg
EDIT: I have since swapped the inlet and outlet ports on the GPU because I was using the wrong ones in the picture, however after benchmarking again temperatures remain the same.

Any help or input is appreciated!
post #2 of 9
If you're getting the same temps you had with an h100, something is definitely up.

First thing, I would try reseating the waterblock.

What thermal paste did you use and how did you apply it?
Edited by RX7-2nr - 9/28/16 at 8:58am
post #3 of 9
Thread Starter 
Alright, the thermal paste I use is Arctic silver 5. I put a small line on the IHS about the size of 2 grains of rice (not much). Twisted the screws from corner to corner, slowly tightening it down. One thing to mention is that when installing the backplate, the top left screw was impossible to thread by hand due to the tight fit between the motherboards passive cooling parts, so I had to carefully use pliers on that one.
Seen here: http://i.imgur.com/OA4Ldpr.jpg
However I did redo it twice and looked at the backplate to see that every screw was poking out through the hole equally as much.
Edited by Shadowcify - 9/28/16 at 9:23am
post #4 of 9
Sounds like too much paste. AS5 also has a cure time. Temps will drop after a number of heat and cool cycles.

I started spreading the paste myself. I put a tiny drop and spread it in small circles with a plastic bag wrapped tight around my fiber. Sometimes I'll have to add a little to make sure the whole cpu top has a very thin layer. I've gotten my best temps with this.
post #5 of 9
Thread Starter 
Okay so basically less is more? I tried to follow the ek instructions on how they applied the paste (since everybody does it differently)
I will reseat the block with the paste method you suggested and get back to you. Time to drain the loop once more woop!
post #6 of 9
You shouldn't have to drain and refill to reseat the block.
post #7 of 9
Thread Starter 
Hmm maybe not I will see what I can do, thanks smile.gif
post #8 of 9
First off, lose the AS5 completely. Your Supremacy came with a tube of GC Extreme, which is a much better TIM that also really doesn't have a curing time.

Idle temps are also a pretty meaningless thing to be comparing. Your favorite flavor of PopTarts actually has about the same amount of bearing on your actual cooling performance - the reason for the jumps is the fact that your CPU is not actually completely idle. A lot of things go into idle temps, not the least of which is fan speeds, flow rates, the way your MB handles power states and voltages, etc. Your concern needs to be temps under load.
post #9 of 9
Thread Starter 
Alright so I reseated the CPU block, unfortunately I had to drain the loop again but oh well. I tightened the backplate to the block even more thoroughly and I took my time and applied a very thin layer of, this time thermal grizzly TIM. Took a picture: http://i.imgur.com/nVdj96J.jpg
I did a burn test and the results only differed by about 3C which I guess is due to the better quality TIM I used: http://i.imgur.com/8N9JYYO.png
However this time I also benchmarked the CPU at stock speeds, removing the overclock but keeping the same vcore at 1.25V which yielded this result: http://i.imgur.com/aJ3EqEF.png
So could it be that these temps are normal and it's just because of the overclock they are reaching 60C on 100% load? I still think it shouldn't matter that much since I have seen much higher vcores with about the same temps
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