Just a RAM question

Solution
1. No, you only have 2 slots.
2. No, but it'll be better if they were.

Bonus answer: 8 GB should be enough for most current applications.
there are more than a few posts about how much ram we need - i do quite a bit of video rendering, which is resource demanding and thought i'd go with 16 gb

since building my computer (i7-4790 cpu) i have monitored my mem utilization and never seen it go above 6.8 gb and only rarely go above 6 gb

others report the same - with mem pricing what it is today, save the coin for another upgrade