How Geeks Callout London Restored an Overheating Gaming PC
For any serious gamer, an overheating PC can quickly ruin the whole experience. Frame drops, loud fans, sudden lag, thermal throttling and random shutdowns are not just annoying, they can also put expensive components at risk.
This case study is based on a real gaming PC repair carried out by Geeks Callout London. The customer had a powerful custom-built gaming rig, but during gaming sessions the system was getting dangerously hot. The CPU temperature was reaching around 90°C, performance was dropping, and the customer was worried that the heat could eventually damage the graphics card and other internal parts.
After a full inspection, cooling upgrade, deep clean and performance check, we were able to bring the system back under control and return it running cooler, quieter and more reliably.
The Problem: A Powerful Gaming PC That Could Not Stay Cool
The customer’s PC was not an entry-level machine. It was built with strong gaming hardware, including:
AMD Ryzen 7 7800X3D processor
MSI GeForce RTX 3060 Ventus 12G OC graphics card
ASUS ROG Strix B650-A Gaming WiFi motherboard
NZXT liquid cooler
Despite the high-performance components, the PC was struggling badly with heat. During gaming and heavier workloads, the CPU was reaching very high temperatures. The GPU was also running hotter than expected, and the system was becoming unstable.
The customer noticed:
Game lag and frame drops
Loud fan noise
High CPU temperature
GPU heat concerns
Random shutdowns during gaming
Performance throttling under load
The main concern was simple: if the overheating continued, it could shorten the lifespan of the processor, motherboard, cooler, graphics card and other expensive components.
Our Diagnosis
When we inspected the system, it was clear that the problem was not just “a hot PC”. The cooling setup needed attention.
The processor was producing more heat than the existing cooler could manage properly. The internal airflow also needed cleaning and improving. Dust had gathered around fans, filters and components, making it harder for the case to move hot air out.
Instead of replacing parts blindly, we checked the cooling system, fans, radiator, graphics card area and general condition of the build. Once we had a clear picture, we explained the repair options to the customer.
The best route was a cooling upgrade, a proper internal clean and fresh thermal paste.
Replacing the Cooler
The first major part of the repair was replacing the old NZXT cooler with a Corsair H100X RGB Elite liquid cooler.
This gave the processor a much better cooling setup. Once fitted, the CPU temperature was far more controlled under load, and the system no longer had to work as hard to keep itself stable.
The customer also liked the cleaner look of the new cooler and RGB lighting, but the main benefit was practical: better cooling and better reliability.
Deep Cleaning the PC
While the PC was open, we carried out a full internal clean.
Dust is one of the most common reasons gaming PCs start overheating. It can block fans, sit inside heatsinks, clog filters and reduce airflow through the case. Even a powerful cooling system will struggle if hot air cannot escape properly.
We carefully cleaned the internal components, including the case fans, filters, radiator area and the MSI GeForce RTX 3060 Ventus graphics card cooling area.
This helped the GPU breathe properly again and improved the general airflow inside the system.
Fresh Thermal Paste
We also removed the old thermal paste and applied fresh paste correctly.
Thermal paste is a small detail, but it is very important. It helps transfer heat from the processor to the cooler. If the paste is dry, old or badly applied, the CPU can run much hotter than it should.
After the new cooler and fresh paste were fitted, the temperature difference was immediately noticeable during testing.
RAM Upgrade
The customer also wanted the PC to feel smoother for gaming and multitasking, so the system was upgraded to 64GB Crucial RAM.
This was not the main cause of the overheating, but it improved the overall experience, especially for heavier use, background applications and multitasking.
The Result
After the repair, the PC felt much more stable. The overheating problem was under control, fan noise was reduced, and the system stopped shutting down during testing.
The biggest improvement was that the customer could play games again without constantly watching temperatures or worrying that the graphics card might be damaged.
The system was:
cooler under load
quieter during use
more stable in games
cleaner inside
better prepared for multitasking
no longer shutting down randomly
This is exactly what a proper gaming PC repair should achieve. Not just replacing a part, but checking the full cooling path and making sure the machine is safe to use again.
What This Repair Shows
This case is a good example of why overheating should not be ignored.
A gaming PC can have expensive components, but if cooling is poor, performance will drop. In more serious cases, the system may shut down to protect itself. Over time, heat can reduce the lifespan of parts such as the CPU, GPU, motherboard and power supply.
Sometimes the fix is simple, such as cleaning the fans and replacing thermal paste. Other times, as in this case, the cooler itself needs replacing.
The important thing is proper diagnosis.
Signs Your Gaming PC Needs Cooling Attention
You may need a check-up if your PC is showing signs like:
CPU temperatures reaching 90°C or higher
fans running loudly all the time
games lagging after a few minutes
random shutdowns during gaming
hot air building up inside the case
GPU temperatures rising more than usual
performance dropping under load
If these problems continue, it is better to get the machine checked before the fault becomes more expensive.
Final Thoughts
For this customer, the repair made a real difference. The old cooling setup was no longer doing the job, and the dust inside the case was making things worse. After installing the Corsair H100X RGB Elite, cleaning the system properly, applying fresh thermal paste and upgrading the RAM, the gaming PC was back to running the way it should.
At Geeks Callout London, we regularly help customers with overheating gaming PCs, noisy fans, cooling upgrades, graphics card concerns and unstable custom builds.
If your gaming PC is getting too hot or shutting down during games, it is worth getting it checked before more serious damage happens.
Author 's Profile
Aamir.M
Aamir Mehmood is a Senior IT Consultant & Technology Writer with over 15+ years of experience and one of the founders of Geeks Callout, an award-winning London-based IT support company specialising in PC, MacBook, and gaming repairs. He is recognised for delivering reliable, customer-focused IT solutions. Under his leadership, Geeks Callout has won multiple honours, including the 2023 Business Excellence Award and the 2025 SME UK Enterprise Award. Aamir also writes insightful articles to simplify complex technology, making him a trusted voice in London’s IT community.
