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Seriously high CPU temps for a custom water loop!

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May 3, 2014 10:00:28 PM

I've got my 4670K to 4.6 ghz at 1.23v and it's perfectly stable, but the temps eventually sit above 70ºC after only 10 minutes of prime95. Based on my limited knowledge of watercooling and overclocking, those temps are disgustingly high for a custom water loop. The Vcore doesn't seem too high to account for the temperatures (right...?).

I idle at 35ºC

The water loop:
- XSPC Raystorm waterblock
- XSPC AX240 Radiator
- XSPC D5 Photon reservoir + pump
- 1/2 inch tubing

I've got good airflow (side intake fan, two front intake fans, back exhaust fan, top two static pressure fans (Corsair SP120s) for the radiator. The case is a mid tower (i believe this is useless information, but oh well).

I'm using Arctic Silver 5 thermal paste, and i don't think reapplying thermal paste will fix the problem considering how high my temperatures are compared to the small benifit you get from reapplying paste.

I don't know if there's anything i can change in the BIOS, or whether my chip has decided to commit suicide.

Any suggestions are appreciated.
a b K Overclocking
a c 89 à CPUs
May 3, 2014 10:23:09 PM

That sounds about right if you have high room temperatures and your water temperature reached steady state.. What is your room temperature near your radiator?

The larger the volume of water, the longer your CPU will stay cool during increasing load transients. Eventually your water temperature will rise reach an equilibrium depending on how well your radiator is set up and room temperature.
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May 3, 2014 10:24:37 PM

take out the radiator and check if there is any dust accumulated on it.insane temps :o  occur if the radiator is clogged with dust or other undesired particles
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a b K Overclocking
a c 90 à CPUs
May 3, 2014 10:30:18 PM

At full load or rather under full stress test, you should not be worried about your CPU temp hitting 70. Which software you are using to read temps readings.
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a b K Overclocking
a c 89 à CPUs
May 3, 2014 10:31:41 PM

Yeah 70'C is ok for intel. Not so good for AMD.
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May 3, 2014 11:05:02 PM

EasyLover said:
Which software you are using to read temps readings.
I've been using HWiNFO. Motherboard is a Maximus VI Formula, and the temperature readings from it are much lower and inaccurate, so i use HWiNFO and monitor the core temperatures.

Here's a screenshot.

Those temperatures are too high for a 4.6 Ghz 1.23v overclock with a custom loop. Something isn't right. :( 

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May 3, 2014 11:12:14 PM

damric said:
That sounds about right if you have high room temperatures and your water temperature reached steady state.. What is your room temperature near your radiator?

The larger the volume of water, the longer your CPU will stay cool during increasing load transients. Eventually your water temperature will rise reach an equilibrium depending on how well your radiator is set up and room temperature.

Room temperature, if anything, is closer to the warm side because of the PC (lol), but i don't know accurately.

How much of a benifit do you think turning on the air-conditioner on cold would make, considering my temperatures? I can't do it right now, seeing as I'm not at home, and i want to avoid freezing myself. :) 

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a b K Overclocking
a c 90 à CPUs
May 4, 2014 12:26:19 AM

Have you checked the temp from within BIOS? Also read the temps from HWMonitor and post here
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Best solution

a b K Overclocking
a c 89 à CPUs
May 4, 2014 9:58:10 AM

The Derp said:
damric said:
That sounds about right if you have high room temperatures and your water temperature reached steady state.. What is your room temperature near your radiator?

The larger the volume of water, the longer your CPU will stay cool during increasing load transients. Eventually your water temperature will rise reach an equilibrium depending on how well your radiator is set up and room temperature.

Room temperature, if anything, is closer to the warm side because of the PC (lol), but i don't know accurately.

How much of a benifit do you think turning on the air-conditioner on cold would make, considering my temperatures? I can't do it right now, seeing as I'm not at home, and i want to avoid freezing myself. :) 



AC will help a lot. When you look at the heat transfer equation for closed loop system:

Q*= M * C (T2- T1)

In English that means Thermal Power (the amount of heat transferred by your radiator) equals mass flow rate of your water (control this with your pump speed and tubing size) times the specific heat capacity of water (could be worse depending on additives) times the difference in temperature between the hot inlet water temperature, and the cold outlet temperature.

So with air conditioning, you are blowing colder air onto your radiator, which makes the cold outlet colder, so the difference in temperature is higher, increasing the thermal power of your radiator :) 

You can certainly increase pump speed, but eventually it will be too loud and actually add heat to the water. You can control your water quality to a certain extent by keeping it as pure as possible, but you still need corrosion and biotic inhibitors. You can spin the fans on your radiator faster, but they will eventually get noisy. In the end it is usually easier to run air conditioning.
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