I have recently come across some issues with my RAM. At first it was idling at around 30% which I believe is normal for 8GB, then it shot up to 90%+ when idle. I don't know what caused this or how to fix it.
http://imgur.com/a/YRdDM#0 - Screenshots of task manager
http://imgur.com/a/YRdDM#0 - Screenshots of task manager