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H110i GT - Sensor - is it working?


Metraton
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Hello everyone.

 

I have an H110iGT mounted on i5-6600K currently OC at 4.2.

 

I performed 15 minute stress test with Prime 95.

 

I was monitoring temperatures with both Corsair Link and HW Info.

 

The CPU cores/packages at full load were stable at 58-59°C

HOWEVER the temp showed by Corsair Link for H110i GT was 32°C. In idle temperature for H110iGT are about 29°C

 

Is it correct? Where is placed the sensor? on the radiator or in the waterblock?

Idle temepratures for H110i GT showed in Corair link is about 29°C

 

I have H110i GT since 2016. During years I've tryed severa configuration (front/top mounting; push/pull). I'm pretty sure to remember that the temperature showed by Corsair link for H110i GT was similar to the one showed for CPU package.

 

About one month ago I decided to clean my rig. I've un-mounted and re-mounted everithing. I've re-applied termal paste and temperature for CPU package are now a bit lower. However it seems very strange to me that under full load in stress test, the temp for H110i GT is 32°C

 

Any idea?

 

many thanks in advance

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I'm pretty sure to remember that the temperature showed by Corsair link for H110i GT was similar to the one showed for CPU package.

 

No, the only time coolant temperature and CPU temperature will be exactly the same is when voltage is 0 (or off). The coolant temperature is a measure of heat in (watts) vs heat dissipated over time. CPU temp is something different and shows the physical temperature state of the silicon in that instant - not power. CPU temp will always be dynamic with rise and fall as voltage is applied or relaxed. The coolant temp is heat in/out tug of war over time. It will be slow to go up or down and is a reflection of how much heat energy is in the cooling system.

 

The relationship between them is coolant temp is the minimum possible CPU temp (at that 0v state). In effect, coolant temp rise boosts CPU temp by the same amount. +1C coolant means +1C to the CPU base. That difference between coolant temperature and the CPU temp is a factor of voltage (primary) and then the physical properties of the CPU and copper plate. That is how the CPU is "cooled". It's all conductive. The pump and fans don't have anything to do with that. They are on waste heat disposal duty.

 

The sensor for the coolant temp is after the block. You will always be a few degrees above the internal case temperature (minimum possible coolant temp) because of that and the heat must go the radiator to be released.

 

So why does the coolant only go up +3C for Prime 95? Likely because the 6600 is set normally and only produces the intel specified 90W. That's not a lot and the cooler is able to dump most of the heat as fast as it's added. Not quite and that is why the temp goes up +3C (and again with sensor location). If I gave you a 16 Core AMD 3950x and ran Prime, I might also be able to keep at 60 with voltage tuning, but my coolant temperature rise would be much larger. This is because that CPU is likely to outputting 180W or more for that load with all those cores. It's watts that moves the coolant temp up. A 1 core CPU running at max voltage might be a 100C, but if it's only outputting 15W, the coolant doesn't move far.

 

You are likely to see the most change in your coolant with mixed loads involving the GPU. Environmental change (room temp, case temp) is often more than the power load coolant temp rise on lower core count CPUs.

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Ehy, thanks for your quick reply.

 

I don't know if I have understtod correctly, now I have a question.

 

I need to keep the CPU as fresh as I can. That's the reason why we use coolers.

 

When OC I look at the CPU temp not to coolant temp. I kave in mind to not to go over 80°C at CPU cores.

 

If I have a difference of 30°C between CPU cores and coolant, does it mean that heat is not trasferred to the coolant in an efficient way?

 

(Anyway you are correct. to reach 4.2 GhZ (base clock is 3.5, boost is 3.9) I doesn't had the need to increasse voltage, so I'm using the stock voltage at 1.168 V and I'm stable. To reach 3.3 I need to bump up vcore.)

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If I have a difference of 30°C between CPU cores and coolant, does it mean that heat is not trasferred to the coolant in an efficient way?

 

No, +30C difference between coolant and CPU temp is good and better than many do at stock settings. People with heavy overclocks often see +40-50C as they push the voltage limit. While it is ultimately the CPU temp that matters, the coolant temp is still the metric to use for fan control. If no increase in coolant temp, then an increase in fan speed won't make the CPU any cooler.

 

It also gives you a guideline for what kind of coolant temp you can allow. If your differential is 30C and your limit 80C, then you can let the coolant temp get up to 50C (which is very high). You are never going to reach 50C coolant temp, so you should not reach your 80C limit either. Cooler is working. Someone with a 50C differential and an 80C limit has to keep the coolant below 30C -- a very difficult task and likely impossible with a single radiator system.

Edited by c-attack
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