I have received a few questions about the RAM so to clear things up:
There are 2 SO-DIMMS installed:
SLOT 1) Mushkin 8GB PC3-12800H
SLOT 2) Samsung 4GB PC3-10700
The 4GB is the original RAM, while the 8GB Mushkin was added by yours truly a few years ago.
See the new pictures I have added which show the system properties view in Windows 10 and also CPU-Z information about the RAM in slots 1 and 2.