I recently built a PC that randomly restarts without warning. Sometimes it reboots within a few minutes of starting Windows, while other times it runs for 30–40 minutes. The problem happens more often when I begin demanding tasks. Replacing the RAM did not solve it, although the system seems to last longer when I use only one memory stick. CPU stress testing reached about 95°C without immediately causing a reboot. What should I check first?
Hardware:
CPU: Ryzen 5 7500F
Motherboard: Gigabyte B650M Gaming WiFi
Memory: T-Force Vulcan 2x8GB DDR5-6000 CL38
GPU: PowerColor Hellhound RX 9060 XT 16GB
PSU: DarkFlash GS750M
CPU cooler: AMD Wraith Stealth
4 Answers
Since one stick makes the computer last longer, reseat both modules and test each stick individually in the recommended slot. If both sticks work alone but fail together, the issue could be memory settings, the motherboard’s memory training, a faulty slot, or the CPU’s memory controller. Running a memory test at default settings can help separate RAM instability from a power or temperature problem.
The power supply is one of the biggest suspects here. Sudden restarts during heavy workloads can happen when the PSU cannot reliably handle the system’s power spikes. The DarkFlash unit is not a particularly reassuring choice, so testing with a reputable, properly rated PSU would be worthwhile before chasing more complicated causes.
Check the CPU cooler installation carefully. Make sure any protective film was removed, the cooler is mounted evenly, and the fan is connected and spinning. Around 95°C is near the Ryzen 5 7500F’s thermal limit. That temperature alone may not prove the cause, especially if the system survives a CPU-only test, but poor cooling or a loose mount could still contribute under combined CPU and GPU loads.
Test the memory at default settings first. Disable EXPO or any manual overclock, then update the motherboard BIOS if needed. DDR5-6000 may be achievable, but running two sticks at that speed can be less stable than using one. Also confirm the modules are installed in the recommended paired slots from the motherboard manual, usually A2 and B2.
Also verify that the cooler has enough thermal paste and that the CPU fan is connected to the CPU_FAN header.