Sure looks like a hardware memory error. Even though memtest86 didn't show an error. Try running memtest86+ (note the +) instead of memtest86. An overnight run should give you at least 8 full passes. Any error indicates defective memory.
This bugcheck indicates that a single bit error was found in this page. This is a hardware memory error.
Follow this tutorial: MemTest86+ - Test RAM - Windows 10 Forums
MemTest86+ is a diagnostic tool designed to test Random Access Memory (RAM) for faults. MemTest86+ will verify that:
- RAM will accept and keep random patterns of data sent to it
- There are no errors when different parts of memory try to interact
- There are no conflicts between memory addresses
Memtest86+ runs from bootable media to isolate the RAM from the system, no other components are taken into account during the test.
MemTest86+ needs to run for at least 8 passes to be anywhere near conclusive, anything less will not give a complete analysis of the RAM.
If you are asked to run MemTest86+ by a Ten Forums member make sure you run the full 8 passes for conclusive results. If you run less than 8 passes you will be asked to run it again.
MemTest86+ has been known to discover errors in RAM in later passes than the eighth pass. This is for information only; if you feel there is a definite problem with the RAM and 8 passes have shown no errors feel free to continue for longer.
Running 8 passes of MemTest86+ is a long and drawn out exercise and the more RAM you have the longer it will take. It's recommended to run MemTest86+ just before you go to bed and leave it overnight.
You could also try removing one of the 4GB memory modules and run that way for a couple weeks, see if that makes a difference. If not swap memory and repeat. This would be a long process but would be definitive as far as good/bad memory is concerned.
Also please set all clocks and voltages to normal/default and see how it runs.
The dumps included in the zip file have two 12 days apart as you mentioned but two are only 1 day apart.
EDIT: If you have the money to spend you could just replace the memory modules and see what happens.