Shortly after upgrading to a Ryzen 7 9800X3D, a new motherboard, and DDR5 memory, my RTX 3080 Ti Founders Edition began randomly ramping its fans to 100% while playing War Thunder. The game remains smooth, but Task Manager and GPU-Z show roughly 15–30% CPU and GPU usage while the GPU hotspot climbs above 100°C. The frame rate is capped at 60 FPS at 2560×1440.
The GPU, power supply, case, and fans were not changed. I have already updated the NVIDIA drivers, BIOS, and Windows 10. The card is several years old and has previously suffered from overheating, so about two years ago I disassembled it, replaced the thermal paste and pads, and used an MSI Afterburner undervolt to improve its temperatures.
Could one of the new components be causing this, or is the card more likely developing another cooling problem? Should I reset any old undervolt settings, replace the thermal paste and pads again, or consider returning a component while it is still under warranty?
4 Answers
Since the frame rate is capped at 60 FPS, relatively low GPU utilization can be expected, especially with the new CPU. Low utilization does not rule out a localized cooling problem: the die can still develop a very hot hotspot even when total board power is modest. Check whether the GPU is actually throttling and whether its clocks are normal; if the hotspot remains above 100°C after restoring defaults, repasting and inspecting the pads and mounting pressure are the sensible next steps.
A hotspot over 100°C at only a 60 FPS frame limit is not typical, although Task Manager is not always a reliable indicator of actual GPU load. Check the readings with HWiNFO, GPU-Z, or an NVIDIA/RivaTuner overlay, and compare the GPU core temperature, hotspot temperature, clocks, power draw, and thermal-throttling flags. A large difference between core and hotspot temperatures usually points to poor cooler contact, dried paste, or uneven mounting pressure.
The upgrade itself is unlikely to damage the GPU or cause this temperature pattern. The more likely explanation is that the older card's cooler contact has deteriorated again. Thermal pads that are too thick can also prevent the heatsink from sitting firmly against the GPU die, so use the correct pad thickness for the exact card and make sure the heatsink is mounted evenly. Clean the heatsink and fans while it is apart.
Reset MSI Afterburner to its default profile and remove any automatic undervolt or custom fan curve before testing. An undervolt normally lowers temperature, so it would not explain an excessive hotspot by itself, but an old profile can change clocks, voltage, or fan behavior. Also verify that the card is fully seated, its power connectors are secure, and the case airflow has not changed.
The card is a Founders Edition 3080 Ti, which has a reputation for thermal issues. I replaced its paste and pads around two years ago, so repeating that work may be necessary, but I wanted to rule out the new motherboard or CPU first.