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Concerning H150i Elite Capellix coolant temps


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Hello,

My system specs are: Ryzen 9 7900X, NVIDIA GeForce RTX 4070, Gigabyte B650 AORUS Elite AX, G.Skill 2x16GB 6000Mhz Cl36, Corsair H150i Elite Capellix, with Kryonaut thermal paste, all inside a Corsair 5000X. I also have 6 intake fans and 1 back exhaust and the 3 radiator fans and radiator mounted at the top of the case, as an exhaust 

I am extremely concerned about the temps of my coolant and CPU, my CPU idles at 60 C while my coolant is at 30 C. But, when running cinebench or any other decently demanding tasks, my CPU instantly skyrockets to 95+ C while my coolant temps continue to remain at 30 C, this is making me worry about the life of my CPU and the performance I am missing out on due to the egregious thermal throttling. Also, I have reseated and repasted my CPU and CPU block multiple times, to no success. And, my pump is needing to max out RPMs at idle to even keep my CPU stable. 

It would be greatly appreciated if someone could explain why this is happening and a possible fix. I was suggested by a friend to replace the coolant but I am not sure about this.

Thank You.

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No, you don't replace the coolant on these and that isn't the issue in play.  Your CPU (and everyone else's) is cooled conductively, regardless of whether you have air cooling, water cooling, or something more exotic.  The heat from the CPU is transferred through the CPU lid to the metal cold plate on the cooler type.  After that the cooler's job is to dump the heat somewhere else.  It's that waste heat removal method and size that differentiates one cooling method or unit from another.  For water cooling, the liquid picks up the heat as it passes over the cold plate, it carries it to the radiator, then some of the heat is blown off elsewhere.  Then it back to the cold plate for another pick up.  Faster pump speed means more picks up per unit of time.  Faster fan speeds means theoretically more heat can be dissipated from the water as it passes through.  However, none of those settings can alter the fixed heat transfer rate from CPU to cold plate.  That means when you start a stress test and it's instantly too hot 1 second in, the cooling method or settings are not at issue.  It's either the conductivity (bad physical contact) or just too much voltage/power to begin with.  When your CPU temps start off OK, but then continuously increase the longer the load is run, then the cooler settings or general capacity are at issue.  

 

AMD CPUs tend to idle higher than intel, but 60C is probably 10C too much.  At 30C coolant temp (this is the lowest possible CPU temp with zero voltage), I would expect you to fluctuate between 45-50C at idle.  You might want to get a more detailed core frequency monitor going like HWinfo or the Ryzen master one to see if your core's are stepping down in frequency or being held at a legitimate higher load.  Also check the Vcore voltage being applied at the same time.  

 

When you repasted, improper contact would have been visible as a large chunk or side of the cold plate where the TIM never spread out or is present in a visible mass.  You also can check this a more ordinary way.  A genuine contact issue will cause erratic temps even with light loads.  Opening a browser or any other ordinary program will create high CPU temp spikes as the voltage comes on, likely close to the CPU max.  It would be hard to do anything and certainly not moderate activities like gaming.  On the other hand, max load tests like Cinebench, Prime 95, etc. require proper BIOS settings and can't always be run right out of the box without slamming into a temp or power limit.  

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