Should the idle core temp equal to water temp?

[mrthanhnguyen]

Not sure about this but my water temp is 23c from a cold boot and my core temp is 28c lowest, most of them is in the 30s. Should it be around the water temp? If yes what cause it? I have a mora 420, cpu block and ram block with dual d5 pump and flow is 261 L/h.
This is my system from cold boot. Min temp is idle temp. The other is other guy’s system and his core temp is around his 15c water. Cpu pakcage is around the same for both system 60w at idle.
Both system use supercool direct die.

 

[Toothless]

Man, did you forget the source of heat will never be the same as your water? IHS, paste, cold plate. It's not 100% efficient.

 

[P4-630]

You may want one of these: https://www.aquatuning.co.uk/water-cooling/radiators/chiller/

 

[Lei]

Man, did you forget the source of heat will never be the same as your water? IHS, paste, cold plate. It's not 100% efficient.

He's direct die cooling.

 

[maxfly]

What you want to compare is your water temp vs your ambient air temp. If you can stay relatively close to your ambient your golden. Comparing to your idle CPU temps to water temp is fun but once you load up your CPU it blows everything up.

 

[ThrashZone]

Hi,
All core 6GHz ?
I'd think you were doing pretty well but just showing realtemp or coretemp can't tell which one and also wouldn't compare either monitoring apps with hwinfo.

 

[Toothless]

He's direct die cooling.

Doesn't matter. The source will always be warmer.

 

[ir_cow]

Doesn't matter. The source will always be warmer.

Correct

 

[Lei]

Doesn't matter. The source will always be warmer.

Carrot

Yeah, but after delidding and seeing someone else's good temps, you aim for the sky

@mrthanhnguyen
Put your pc under load for sometime, let the water warm up. Then without turning the PC off, stay idle until water reaches ambient again. How close are the temps now?

It's either your mobo warms the cpu a bit, or your TIM is either too much or crappy.

Sometimes my coolant is warmer than the gpu. And my thermometer is accurate as hell. (I know bcz my hdd and thermometer read the same when I cold boot after a long night)

 

[Fangio1951]

hi all,

Mine is always 2 - 5 deg C difference.

And it's been that way since my first wc plunge with a i7-4770K then i7-4790K then i7-7700K and currently a i9-9900K.

And the i9-9900K has a pure copper IHS.

All the above were de-lided with Thermal Grizzly Conductonaut liquid metal .

 

[Toothless]

Yeah, but after delidding and seeing someone else's good temps, you aim for the sky

@mrthanhnguyen
Put your pc under load for sometime, let the water warm up. Then without turning the PC off, stay idle until water reaches ambient again. How close are the temps now?

It's either your mobo warms the cpu a bit, or your TIM is either too much or crappy.

Sometimes my coolant is warmer than the gpu. And my thermometer is accurate as hell. (I know bcz my hdd and thermometer read the same when I cold boot after a long night)

You're not, ever, going to have perfectly equal temperatures between the processor and water. Delidded or not. You're not smarter than physics.

 

[mrthanhnguyen]

Im not looking for equal. At least 3c delta but I have like 7c delta.

 

[Lei]

Im not looking for equal. At least 3c delta but I have like 7c delta.

Where the thermometer in your loop? The water is warmer on the cpu, than after the radiator

How big is the other guy's reservoir?
Use liquid metal...

You're not, ever, going to have perfectly equal temperatures between the processor and water. Delidded or not. You're not smarter than physics.

Throw a burning match in teaspoon of water. The water vaporates and match is dead wood.
Processor can get colder than water and then water starts giving heat to processor. That's what's physics do. At idle, metal loses heat faster than water does.

 

[ThrashZone]

You're not, ever, going to have perfectly equal temperatures between the processor and water. Delidded or not. You're not smarter than physics.

Hi,
Funny mine is lol
My water temp sensor shows 32c and so does a lot of my core temps
I'm not bare die or doing 6GHz though

Im not looking for equal. At least 3c delta but I have like 7c delta.

Hotter chip ?

 

[lilhasselhoffer]

No. Let me explain why by basic physics.

The CPU creates energy, in the form of heat. Energy can only disperse from high concentration to low. It disperses faster the higher the difference. In this way the CPU generates heat, that increases its temperature. That energy transfers into the water loop, more energy the more the temperatures differ, until such time as you reach a steady state between CPU and cooler.

If you then take a sensor for air temperature it should be lower than the water loop. Both actually start at ambient...and the reason for the huge radiator surface area is that as the water is closer to air temperature you need to transfer that energy over a much larger surface area because the delta in temperatures is smaller...


TL;DR
You're good. q(energy transfer) = -k(thermal conductivity)*deltaT(difference in temperatures)
Less physics minded, to transfer heat by conduction you need a difference in heat between surfaces (delta T above).


Edit:
You can also have a bad loop. Temperature is a measure of energy...but you can have a delta that is fractional and assuming you run a cool CPU it'd show the same. That said...why in Hades would you spend money on a liquid cooler for than...unless you're morally opposed to a fan...

 

[unclewebb]

Intel CPU temperature sensors are designed and intended to be used for only one purpose. To control thermal throttling at 100°C. They have never been 100% accurate when a CPU is idle. They are not calibrated for that purpose.

It is also very normal for the true core temperature to be slightly hotter than the water temp or the air temp or anything else. The source of the heat will always be hotter than anything surrounding it.

Most Intel temperature sensors are only accurate to +/- 5°C.

 

[Calenhad]

Im not looking for equal. At least 3c delta but I have like 7c delta.

You will never have equal temps from cold boot. Either the water is warmer or the CPU. My computer have been on for about 12 hours now. and CPU, GPU and water temp all read 29C. They do not read 29C when I cold boot my computer in the morning.

The water is warmer on the cpu, than after the radiator

Not true unless you have the worst flowrate in the history of watercooling. The water everywhere, in a decently built loop, will be within the margin of error of any temperature sensor normally used in a custom loop.

 

[Lei]

Not true unless you have the worst flowrate in the history of watercooling. The water everywhere, in a decently built loop, will be within the margin of error of any temperature sensor normally used in a custom loop.

My reservoir is 5 gallons. You're welcome

The flowrate is fine, but lake freezes from top and fish peacefully swim under, so temp is not the same everywhere.

 

[Toothless]

My reservoir is 5 gallons. You're welcome

The flowrate is fine, but lake freezes from top and fish peacefully swim under, so temp is not the same everywhere.

You've never heard of water moving below freezing?

 

[Steevo]

Im not looking for equal. At least 3c delta but I have like 7c delta.

You are assuming the processors thermal sensor is accurate.
Without placing a thermocouple between the die and plate there is no way to know exactly how accurate it is.

The lower the Delta T the less thermal flux, there MUST be some gradient.

 

[Lei]

You've never heard of water moving below freezing?

Arctic Ground Squirrel body temperature drops to -2.9°C for upto 9 months. It can clear its blood and body fluids from water to prevent icing. It can also go brain dead and regenerate the synapses.

They mate in late April (now )
One male may have more than one wife, and vice versa.
They're sleeping most of the year, so I guess no time to pick up the right date.

Female sleep in August, male next month. And male wakes up 3 weeks earlier.
Male ones kill the kids of other squirrels and eat them (whoever enters my territory shall die or be my son)

After waking up, within 2 hours all their dead brain cells recuperate.

They have the lowest body temperature of all mammals.

Yeap, to know how their brain recovers after hibernation, scientists took their brains out and sliced them into Doritos right after they woke up.

Their neck never drops below 0.7°C

Every 2 to 3 weeks during hibernation, they shiver and bring their temp back to normal 36.4°C for 12~15 hours, then freeze again.

Imagine how your life would be, if you were awake only 3 months of a year. Be born, mature, sleep, wake up, mate, conquer.

 

[Toothless]

Arctic Ground Squirrel body temperature drops to -2.9°C for upto 9 months. It can clear its blood and body fluids from water to prevent icing. It can also go brain dead and regenerate the synapses.

They mate in late April (now )
One male may have more than one wife, and vice versa.
They're sleeping most of the year, so I guess no time to pick up the right date.

Female sleep in August, male next month. And male wakes up 3 weeks earlier.
Male ones kill the kids of other squirrels and eat them (whoever enters my territory shall die or be my son)

After waking up, within 2 hours all their dead brain cells recuperate.

They have the lowest body temperature of all mammals.

Yeap, to know how their brain recovers after hibernation, scientists took their brains out and sliced them into Doritos right after they woke up.

Their neck never drops below 0.7°C

Every 2 to 3 weeks during hibernation, they shiver and bring their temp back to normal 36.4°C for 12~15 hours, then freeze again.

View attachment 292587

Imagine how your life would be, if you were awake only 3 months of a year. Be born, mature, sleep, wake up, mate, conquer.

Wake up and bang? I'll take that over working my life away.

 

[mrthanhnguyen]

Now I turn on c state and all power saving feature then cpu and voltage clock down so core temp is around water temp within 3c.

 

[ThrashZone]

Now I turn on c state and all power saving feature then cpu and voltage clock down so core temp is around water temp within 3c.

Hi,
There you go
I'd bet some inactive cores are showing at water temp now to

31c atm

 

[phill]

Just a quick question - what is your ambient temp? Roughly...