Hi i just got an upgrade for my gpu from 9600gt to gtx660. i'm experiencing some stuttering issues on csgo lately and i've been wondering if i should add in more RAM or change the cpu. my current cpu is AMD Phenom II X4 B50 3.10Ghz. also my motherboard is BIOSTAR TA790GX 128M. should i change both of these? if yes what is it? pls i'm no techie my budget is probably in the mid range around $150