Hi,
I'm afraid I may have introduced more confusion...
The SSD should be "Initialized" as appropriate for your machine..
If your machine is using Legacy Bios, then yes... The SSD should be "MBR"...
You do this by deleting everything on the drive and starting over...
I doubt that this is causing you a problem... I only mentioned this to cover all the bases for possible "SSD Settings"..
I didn't realize that you didn't replace memory as a matched pair\set...
This can sometimes causes problems... Especially at higher memory clock speeds...
But yes... Try a reinstall on the SSD with the new stick removed... That would be the best shot of resolving this in one try...
I would also advise to "Disable" the Intel RapidStart, or not install it at all...
It is similar to the built-in Windows Fast Startup, which will probably be better anyway...