You can't use 4000MHz RAM because it exceeds standard compatibility limits.
You can't use 4000MHz RAM because it exceeds standard compatibility limits.
You're facing issues with your 9900k system using an Aorus Masters motherboard and hyperX Predator GPUs. The problem seems to stem from BIOS settings not being properly configured, especially after multiple BIOS resets. XMP only sets the speed to 3200, but you're experiencing boot failures. It might help to double-check your BIOS version, ensure all components are compatible, and consider consulting a professional for further troubleshooting.
The 9900K supports up to DDR4-2666 RAM. Exceeding this is essentially overclocking, possibly through voltage adjustments or favorable silicon conditions. It’s best to gradually raise the voltage and test performance. See the relevant link for details.
Your current setup might not be optimal—CPU temperature could be too high, voltage levels may not be ideal, and adjustments like XMP might not yield the expected results. I’d stick with standard settings and experiment later.
Your RAM is labeled as Basic. Let me know if you need more details!
Your i9-9900K's memory controller likely won't support DDR4-4000 MHz stability. That high speed isn't reliable. Have you considered using a lower frequency version like DDR4-3600 or 3800?
It looks like your setup struggles with higher speeds due to compatibility issues. The motherboard you picked supports up to 4133 MHz, but your CPU only has a 9900 MHz clock speed. That mismatch can cause performance bottlenecks. They might claim it can run at that speed because the motherboard’s features compensate for the CPU limitation, but in practice, you’ll likely hit the ceiling.
The motherboard supports the load. The CPU is the limiting factor. Intel only backs the i9-9900K with DDR4 up to 2666MHz. Anything beyond that needs CPU overclocking—any attempt will have uncertain results. The 10th Gen Intel chips appear to manage higher DDR4 speeds more effectively (for example, 4000MHz+). Generally, 7th, 8th, and 9th Gen Intel models run at around DDR4-3400 to DDR4-3800.