When the CPU Sizzles: Overcoming Overheating Challenges After PSU Installation


Could you provide guidance on a CPU overheating issue? After replacing my power supply unit with a Corsair RM750x, my computer began to experience immediate shutdowns and reboots during intensive gaming sessions. Despite setting the AIO pump and fans to maximum, the CPU temperature soared to 100ºC upon startup. I’ve attempted to secure the CPU cooler and its brackets, and I’ve also repositioned the delidded CPU’s metal piece to ensure proper contact. However, the problem persists. I’m seeking advice to resolve this without having to wait for a new CPU, which would take a week to arrive.


A user reports that after swapping their power supply unit to a Corsair RM750x, their CPU temperature spikes to 100ºC, causing immediate shutdowns during gaming. Despite maxing out the AIO pump and fans, the issue persists. The user has re-secured the CPU cooler and repositioned the delidded CPU’s metal piece for better contact, yet the problem remains unresolved.

Expert Analysis:

CPU overheating can be a perplexing issue, particularly when it occurs after a PSU swap—a task that typically doesn’t involve the CPU directly. Here are some expert-recommended steps to troubleshoot and potentially resolve the overheating issue:


Check Thermal Paste Application:

Ensure that the thermal paste between the CPU and the cooler is applied correctly. Too little paste can result in poor heat transfer, while too much can act as an insulator, trapping heat.


Inspect Cooler Mounting:

Verify that the CPU cooler is mounted evenly and firmly. An uneven mount can create hotspots on the CPU.


Review BIOS Settings:

Sometimes, BIOS settings reset after hardware changes. Check that the CPU voltage and fan control settings are optimized for cooling.


Evaluate AIO Cooler Functionality:

Confirm that the AIO cooler is functioning properly. Check for any leaks, listen for the pump operation, and ensure that the radiator isn’t obstructed.


Monitor PSU Output:

A faulty PSU can cause voltage fluctuations that may lead to overheating. Use software tools to monitor the PSU’s output.


Consider Delidding Impact:

Delidding can improve cooling but also introduces risks. If not done correctly, it can lead to uneven heat distribution and increased temperatures.


Seek Professional Help:

If the issue persists, consider taking your setup to a professional. They can provide a thorough inspection and suggest repairs or replacements if necessary.


Resolving CPU overheating requires a methodical approach to identify and address the root cause. By following the steps above, you can systematically troubleshoot the issue. If all else fails, professional assistance is the next best step to prevent further damage and ensure your system’s longevity and performance.

Remember, while waiting for a new CPU might seem like a setback, ensuring the current CPU’s health is paramount for your system’s overall stability and performance.

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