You could have an issue with either your CPU or memory, or possibly motherboard, I would troubleshoot CPu and memory first
You didn't mention what cooling your using, I would suggest removing your motherboard from your case and test flat on the box it came in, remove your CPU cooler, remove your CPU and check your CPU socket with a magnifying glass for bent or misaligned pins and contact with your CPU, very carefully reinstall your CPU and heatsink or block per manufacturers recommendations, do not over tighten, install only one stick of memory in the slot per owners manual, clear cmos, set all on board switches to there default state and test at all default settings
What memory kit, manufacturers model number, is it on the QVL list?