So I have a new pc arrived recently. So I bought a Cougar CFD120 fan for Intake and I also have 2 80mm fan in the side and in the back. I served them as my exhaust. I'll buy a 120mm fan ASAP to replace my 80mm fan in the back side. So I have this side fan, a 80mm one. Is it really necessary? Or just leave it? I don't have a graphics card. I'm just using the onboard graphics since it's an APU(AMD A10-7850K). If side panel fan is not necessary, is it ok to use 80mm exhaust fan in the back TEMPORARILY? Another question, I'm using this Kingston KVR16N11S8/4. Which is a 4GB 1600mhz RAM and using a ASUS A68HM-K MoBo. What brand will you recommend to me? I'm in a tight budget right now. How about 8GB G. Skill RipJaws X (4x2)2133Mhz ? Is this fine for my CPU?