High CPU temperatures with water cooling (70°C)

[AdmiralThrawn]

Hey everybody
Hope this is the right subforum, similar topics are all in "Overclocking", but considering that I never overcloked any component in my build ....

Anyways, I recently got myself a Cooler Master Seidon 120v as a replacement for my stock Intel cooler (which went up to almost 85°C).

Now the problem seems to be that I can just not get a "great improvement" in temps.
Idle is about 25° to 33°, but simulating heavy load with Prime95 gives me temperatures of 78° C and that seems way to high (with the fan at 100%).

Another thing I noticed was that the air being pushed out the the rear of my case was nowhere near warm.

I already did check my thermal paste and it seemed to be well spread out.

System Specs (nothing is overclocked):
Case : Cooler Master N500
CPU : Intel i5 2500 @ 4x3.3 Ghz
Cooler : Cooler Master Seidon 120v v2
Mainboard : Intel DH67CL

Any help would be greatly appreciated
Thanks and have a nice day!

 

[Mr_Venbeer]

Thermal paste doesn't have to be well spread out. If you could reapply some good quality compound using the pea method, it should improve your temps at least a little. Prime95 is a torture/stability test and will guaranteed make the CPU run much hotter than it usually does underoload. What are your temperatures while you game?

NOTE: Every time you remove the water block you should always replace the compound because otherwise you get air bubbles and dust, which lowers the efficiency of the cooler.

 

[AdmiralThrawn]

Thanks for your answer!
While gaming I get temps of about 65° to 70° C (in Batman Arkham City, I played for 2 hours or so).

I did reapply new thermal paste when removing the block and I also used the pea method and then screwing in the screws x-wise.
I used the Cooler Master stock paste, but using high quality stuff should only make a little temperature difference and not 20 or 30 degrees, right?

 

[Mr_Venbeer]

No worries. 65-70 degrees C is pretty good, nothing to worry about. Yes, it only makes a small difference to use higher quality paste, but also may last longer, may be non-conductive, etc.

 

[AdmiralThrawn]

Ok thanks, i was just concerned because my brother always tells me how well his cooler works (He's got a Corsair one and an AMD chip) and he barely reaches 40 degrees even with Prime95

Edit : Also I watched this video and the guy got 37°C with Prime95 with the same cooler (so you can see why I am so much concerned)
https://www.youtube.com/watch?v=vTXHgtJJ1r8

 

[Mr_Venbeer]

That's a bit weird. His room temperature must be much lower (guy on Youtube). Maybe your cooler is faulty or something.

 

[AdmiralThrawn]

That's a bit weird. His room temperature must be much lower (guy on Youtube). Maybe your cooler is faulty or something.

Well I haven't noticed any weird noises or things like that from the pump and the blue Indicator LED is shining constantly. I also double checked the cooler mount and it sits tight, no chance of any displacement.

I'm thinking about contacting Cooler Master to see what they think of the issue

 

[Mr_Venbeer]

That's a good idea. Good luck 😉