i have a i5 2500 and my temperature is currently at 40 -50 at idle ...but it goes above 90 and bsods even after cooling down ...so the thing is i didnt change the stock cooler from my previous pentium g620 and im using it on the i5 2500 ever since i bought it..so should i use an aftermarket fan or just put on the i5 2500 fan on it... or should i buy new fan cases?