Thank everyone for your suggestions.
The two sticks are good at default bios settings and memtest86 (3 separate tests).
Catnip - by loosen to do mean a larger number or a smaller number for the timing?
Here are the screenshots from cpu-z..
View attachment 115414 View attachment 115415
It shows your RAM as running on JEDEC #6 or 2133 MHz. That RAM should be just humming along with no problems at all at that speed, so that is good. The question is why won't the RAM run at its rated speed? Don't forget to set the voltage when you set the timings, unless you are using XMP, then it does it for you.
Loosening the timings means going to a larger number. So if your CL (CAS latency) is 15, you could try it at 16 and see if that stabilizes things for you. Only adjust one parameter at once though and maybe don't touch the parameters that are not mentioned in CPU-Z. And try not to overvolt the RAM. I wouldn't go any higher than 1.36V if you were thinking of doing that. Better yet, leave it at 1.35V and don't mess with the voltage too much. It can break the RAM if it is too high.
I just got rid of some GSkill 3600 RAM in an upgrade, and those timings for the XMP mode were the same as mine. My PC was running flawlessly with those timings at 3600 MHz. I would assume that yours should as well.
At this point I am wondering if there is a bad memory stick, or as RJARRRPCGP is suggesting, a machine check error. To rule out a bad stick, run Memtest86+ for a few passes with the RAM set at default (2133 MHz - the way it is now), and then at 3600 MHz to see if there is a difference. If it fails at 3600 MHz, try loosening the CL timing by one and try again. This can be a long process.
But before you do that, do the check on the machine check error in Event manager. It may not be your RAM that is the problem here. What is your CPU voltage? And are you overclocking?
