If we pretend ur mobo is ok and in usuall of times ur mobo makes no issue
U can overclock it.to 4.8 ghz or or some overclockers say on 5.2 ghz too!
But it uses more power and I think 750 psu works fine
But if the clock goes higher than 4.4ghz u need a better cooler.like.liquid cooler so u should afford a better cooler to avoid high temprature sequences and issues I use deep cool brand and im satisfied
Best regards.khd