The sun is actually quite a decent bit hotter than that. Your CPU is running almost 70x cooler.
In any event, there are only so many things that could be wrong. Your case has 0 airflow, you mounted it wrong, its defective, its a bad CPU, you did the thermal paste wrong, or theres a problem with the software. Trouble shoot them. Re-apply thermal paste, re-mount cooler, get new software, crack open case and let it run side-less.