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1. Are you at stock currently?
2. What heatsink and fan?
3. How many intake/exhaust fans on the case?
4. Is the case airflow unobstructed by the desk or any other things nearby?
Also, I removed the links from your sig - we only permit certain external links in sigs, you can find the full sig rules through the rules link at the top right if you are interested.
If you want to try to get by without purchasing anything yet... You might do better on temps if you try pointing your top back fan blowing inwards or reposition it somewhere as an intake where its not pulling warm PSU exhaust... Right now you likely have negative pressure in the case, as your PSU is exhausting air, your top back fan is exhausting air, and the only intake you have is a front panel fan that often is fairly obstructed either by drives or front panel.
I'd move the top back fan to either the sidepanel blowing in on the HSF, or in the top panel, blowing down towards the HSF.
Also with more intake than exhaust, just slightly positive pressure minimizes dust buildup around gaps in the case.
I'd try temporarily moving the back fan around and seeing what it does for temps, or adding another case fan for intake. Those are your cheapest options.
If that doesn't help, or you want the biggest difference in temps, you could spend $30-50 on a new HSF and be in much better shape.
^^^ Well, whats illustrated is a negative air pressure layout. Dust bunnies love those
However you set up the fans, make sure air is flowing. Ideally cool fresh air intake and warm exhaust air. Even with stock HSF (heatsink fan), I'm pretty sure it's not installed properly for temps to be that high at stock settings.