So my dear master race I summon you to help a fellow peasant!
So I recently bought a new laptop, and wanted to work on some titles that skipped PS3/PS4. All is cool and dandy, but since I've bought it, I was questioning whether 4GB of RAM is enough (my other components aren't but I can't upgrade them so there you go), especially since Windows 8.1 is apparently eating up 49% of my 3,88 disposable memory.
So I tried some games, Alan Wake, Metro 2033, Crysis 2 and everything is cool. But then I launched SWTOR and Planetside 2 and BAM! I'm on my desktop with a Windows message recommending to shut some apps cause I'm running out of memory, I check the task manager and my memory usage is at 3,4-3,7 GBs.
So here comes the question. I have a spare memory slot, I want to upgrade my RAM. I couldn't find another same stick as mine. What should I look at so the new stick would be paired and working perfectly? Motherboard compatibility, frequency, timings, voltage, manufacturer? What is important what is not? Is it OK to combine 4 + 2 gig sticks (I assume yes) cause I think 6GBs would close the deal.
Or would it be better if I sold my current stick and get a better 4GBs one like for example with an CL9 instead of a CL11 at 1600 MHz frequency, would I see a difference in game performance with better timings?
The less specialized language you use the better 
appriciate all the help!
So it is happening...PS4 preorder.
Greatness Awaits!
Essay Pro