CPU not cooling

[mateilaflo157402da]

9 months ago I bought a pre-built gaming PC. It has an Intel I7-11700K and an AIO MSI MAG Coreliquid 240R. It worked perfectly and it didn't get too hot during gaming sessions, but recently, the computer has been going slower a few minutes after turning it on. I found out that the slow speed was because the CPU was overheating, so to protect it the power was reduced.
The problem is in the water cooling, however I don't know what part of it exactly. I changed the thermal paste but it was still overheating. The BIOS says the pump fan is working fine (4000 RPM) and I don't think there's been a liquid leak as the graphic card is right under, which is full of dust so a little bit of water would erase the dust and maybe even break the GPU. I read that MSI had trouble with this model of AIO as the liquid created sediments inside the tubes and radiator, but my S/N is not included in the list of the ones that had that problem. Alao, one of the tubes ( I think the one that goes from the CPU to the radiator) is very hot (like the CPU), but the other one reamins cool. The air that get's out of the radiator is also cold, but the CPU is at 99ºC.
I don't know if I'm the only one with this problem.
Should I change the AIO for another model of water cooler?

 

[derbi.carlo152402cf]

I’ve got excactly the same problem as you said above and also my serial number doesn’t appear as an affected ones of the list. I’ve opened a ticket and waiting to get replied by MSI team.

 

[jignaciodia15f102f5]

Hello, I have exactly the same problem as you both. Did you receive any answer from MSI?.

 

[frantzgoncalvesson81159402e0]

I'm really sorry to hear about the issues you're facing with your AIO cooling system. It sounds like you've done thorough troubleshooting. Given the specific symptoms you've described, it might be worth considering a different perte de model of water cooler. It's crucial to address this promptly to prevent any potential damage to your CPU. Additionally, reaching out to MSI support for their insights could be beneficial. Hang in there, and I hope you find a solution soon!

 

[kalaishaai14f102d1]

In a system akin to RoTONDA Real Estate, detecting one warm tube from the CPU to the radiator alongside another cool one raises concern for circulation issues. Despite not falling under known problems, sediment accumulation or internal faults might be in play. Urgent action is vital to avert potential damage, prioritizing prompt intervention to safeguard RoTONDA's integrity.

 

[ryanleon93159802e5]

Suffering with somehow same situation on my cpu while working on a male goldendoodle names site.

 

[barkertiedemannson157a02e0]

From your symptoms, the most likely issue is restricted coolant flow or a failing pump/block in the MSI MAG Coreliquid 240R, even if the BIOS still reports RPM, because pump speed does not always mean proper circulation. The fact that one tube is extremely hot while the other stays cool, and the radiator exhaust remains cold while the CPU hits 99°C, strongly suggests the heat is not being transferred through the loop correctly—often caused by internal clogging or pump degradation, which has been reported with this model. Reapplying thermal paste rules out a mounting issue, so replacing the AIO is the safest and most practical solution, preferably with a more reliable cooler or high-end air cooler. It’s similar to different types of deer feeders—if the internal feeding mechanism jams, the system may look active but won’t function properly.

 

[villerblender815b902e4]

The symptoms strongly suggest that the MSI MAG Coreliquid 240R is no longer transferring heat properly, even though the pump reports around 4000 RPM. A pump speed reading does not always confirm that coolant is actually circulating, and the combination of a very hot CPU-side tube, a cool return tube, cold radiator airflow, and CPU temperatures near 99°C points toward restricted coolant flow or an internal blockage. Since replacing the thermal paste did not help, I would first check the mounting pressure, pump connection, radiator position, and BIOS pump settings, but given the known history of issues with some Coreliquid 240R units, replacing the AIO with a reliable newer model would be a sensible solution if troubleshooting confirms poor circulation. Avoid continuing heavy gaming while the CPU is repeatedly hitting its thermal limit, whether you are playing Stick War Legacy or another demanding game, because sustained overheating can cause significant throttling and reduce performance.

 

[sophiacartersc263]

If the CPU is reaching 99°C even though the pump appears to be running, there may be an issue with coolant circulation or a blockage in the radiator. It may also be worth checking whether the cooler is properly mounted and whether the pump is actually circulating the coolant. High temperatures can also affect overall electricity bill usage when the system is under heavy load for long periods.

 

[theodoreashford7]

The symptoms sound like they could point to poor coolant circulation rather than a thermal-paste issue. If one AIO tube is getting very hot while the other stays relatively cool and the radiator remains cold, the pump may be running electrically without actually moving coolant properly. Given the known issues reported with some 240R units, I’d check the pump/block and coolant flow before spending too much time on the CPU itself. If the temperatures are still hitting 99°C under light load, replacing the AIO would certainly be worth considering, especially if it’s still the original cooler.

 

[liacar56788]

If the CPU is not cooling properly, I would first check the cooler installation, thermal paste, fan operation, and airflow inside the case. It is also worth monitoring CPU temperature and power usage while the system is under load. Keeping an eye on overall power consumption can be useful too, especially if you are also trying to understand changes in your Electricity bill.

 

[novaknox507]

I had a similar concern about how much power a PC can end up using when it is running under heavy load for long periods. An overheating CPU can affect performance, but it also makes me think about overall electricity consumption when a gaming system is running for hours. Keeping an eye on your electricity bill can be useful for understanding your electricity usage over time, especially if you regularly use power-hungry devices like a gaming PC.

 

[jjsanasjnb]

The overheating issue sounds serious, especially with the CPU reaching 99°C, so checking the AIO cooler and pump would be a good next step. Beat The Heat Window Tinting Texas crews serve San Antonio, Houston, Austin, Dallas, and the communities around them. You get the same trained team and warranty in every city.