handsomepigeon :
I've just put in 2x4gb sticks of normal RAM from my old desktop PC and everything works fine. So what is the problem?
Mix and matching ram can work fine however most of the time these things happen:
1. pc doesn't boot
2. ram won't run in dual channel, tripple channel, quad channel,... which ends up loosing you performance
3. instability issues
4. 1 or more stick(s) don't work
5. ram is detected but not all can be used