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Old 20th March 2017, 9:25 PM   #1
SiriusDragon Thread Starter
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Question CPU water block problem - wide temperature range

Hey all... having an odd problem with CPU temps...


Click to view full size!


See those CPU temp variations?

One core goes as low as -8 minimum, meanwhile the maximums are a ~10 degree lower difference between the other cores.

The block is a full nickel EK Supremacy (not EVO or MX), and I get a heap of condensation on it so the water that's going into it must be pretty cold.

Could it be a bad mount? Bad thermal paste? I'm using MX-2 but I've read Thermal Grizzly Hydronaut works well at sub-zero/low temps.

Any advice?
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Old 21st March 2017, 2:06 PM   #2
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I think the temp reading off that core is faulty. A bad seat would not give reading like this. The other threads are pretty comparable with just one being vastly cooler, thus my opinion.
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Old 22nd March 2017, 8:24 AM   #3
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Quote:
Originally Posted by leithals View Post
I think the temp reading off that core is faulty. A bad seat would not give reading like this. The other threads are pretty comparable with just one being vastly cooler, thus my opinion.
That's awkward then... I guess I can offset the temperature for that core in RealTemp or whatever so I'll do that.

I'm going to get some Thermal Grizzly Hydronaut and also remount the block too.
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Old Yesterday, 1:17 PM   #4
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Fricking aaaaargh

I realised what the issue is, it's the Nulon anti-freeze I added. It's gunking up the micro channels and stuff in all the blocks

So I'll have to flush everything and go back to distilled and use plain glycol as anti-freeze.
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Old Yesterday, 1:25 PM   #5
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Don't use normal Ethylene Glycol - you'll run into viscosity issues. Been there, done that. Pumps have to work harder, flow rates go down, loop gets noisier for worse temps.

Just run DI and a bit of biocide. Or remix your coolant weaker?
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Old Yesterday, 1:32 PM   #6
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I had gunk in my blocks too and I used distilled water, do you have clear hoses? Apparently clear hoses give off residue that builds up, only ways around it are either flushes or black zero maintenance hose.

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Old Yesterday, 1:58 PM   #7
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What are you doing to your loop to get lower than ambient?.

Yes, car coolant I've ran into issues in the past with it blocking micro channels, especially if it is a strong mix.

I just run pure Deironised water with no silver etc (but I try to keep to only copper/brass loop, no other mixed metals) and I've never had an issue for the last 10 years.
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Old Yesterday, 2:02 PM   #8
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Quote:
Originally Posted by juzz86 View Post
Don't use normal Ethylene Glycol - you'll run into viscosity issues. Been there, done that. Pumps have to work harder, flow rates go down, loop gets noisier for worse temps.

Just run DI and a bit of biocide. Or remix your coolant weaker?
Are there any other anti freeze options? If I run plain distilled it'll freeze in the chiller

I wasn't going to use just glycol, I'd be mixing it with about 50L of distilled water so I was thinking maybe 1L of glycol would be enough to lower the freezing temp by a decent amount?

Also I'm using an Iwaki RD-30 and an Eheim 1262 as my pumps, so they should be able to cope with whatever I use.
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Old Yesterday, 2:04 PM   #9
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Quote:
Originally Posted by aussie-revhead View Post
I had gunk in my blocks too and I used distilled water, do you have clear hoses? Apparently clear hoses give off residue that builds up, only ways around it are either flushes or black zero maintenance hose.

Non-clear tubes. I shouldn't have blockage issues with the distilled, I think I just mixed in too much Nulon

Quote:
Originally Posted by Annihilator69 View Post
What are you doing to your loop to get lower than ambient?.

Yes, car coolant I've ran into issues in the past with it blocking micro channels, especially if it is a strong mix.

I just run pure Deironised water with no silver etc (but I try to keep to only copper/brass loop, no other mixed metals) and I've never had an issue for the last 10 years.
Using a Hailea HC-1000A water chiller

And yeah... I probably mixed in too much Nulon
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Old Yesterday, 2:09 PM   #10
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Maybe if you can get some pure stuff.

https://www.amazon.com/Ethylene-Glyc.../dp/B00F3BLZK0

Since it's not a car engine you probably don't need all the other additives, which in reality just make the liquid more viscous due probably all the suspended additives.
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Old Yesterday, 2:12 PM   #11
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Quote:
Originally Posted by aussie-revhead View Post
I had gunk in my blocks too and I used distilled water, do you have clear hoses? Apparently clear hoses give off residue that builds up, only ways around it are either flushes or black zero maintenance hose.

I remember that around 10 years ago, everyone was recommending "Clearflex" or similar at the time, after a period of time there was a build up of sticky white powder in the tubing.

Since then I've gone to a nice dark blue see through still, tubing and even after 5 years it's still mint inside. Can't remember the brand.
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Old Yesterday, 2:57 PM   #12
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Quote:
Originally Posted by Annihilator69 View Post
Maybe if you can get some pure stuff.

https://www.amazon.com/Ethylene-Glyc.../dp/B00F3BLZK0

Since it's not a car engine you probably don't need all the other additives, which in reality just make the liquid more viscous due probably all the suspended additives.
Yup, that's the sorta stuff I need. Not sure where to start looking for it though, maybe chemists? Or hardware stores?

Worst case I could order it from Amazon but that seems overkill...
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