How to stop Unreal Engine 5 from crashing on DDR4 2666?

There is nothing more frustrating than a random crash to desktop right in the middle of rendering complex lighting; it felt like gambling every time I hit 'play'. Looking at the logs, the default timings on this Kingston DDR4 2666 were causing random latency spikes of 22-30ns when handling massive vertex data, which just broke the CPU synchronization. I tried the usual 'update the BIOS' routine, and while it booted faster, the crashes actually happened more often—a complete waste of time. I went back into the BIOS Advanced settings and loosened the main timings from 19-19-19-43 to 20-20-20-45, then bumped the DRAM voltage from 1.2V to 1.25V. After five grueling passes in MemTest86, the error count dropped from 42 to zero. I actually messed up once and set it to 1.4V, which triggered an overtemp protection restart and nearly gave me a heart attack. Now it runs cool at 42-48℃. After a four-hour stress test, the temps stayed locked at 42-48℃.
Category:Troubleshooting Last updated:March 13, 2026 11:20 AM