temps are ok if its no a stock cooler, occt is an extreme test, normal operation id say it hits hi 60's or low 70's. If it over heats it will throttle it down and lag the system, but wont crash.
will this http://www.overclockers.co.uk/showproduct.php?prodid=HS-005-AN&groupid=701&catid=57&subcat=1395 still allow use of all the ram slots?