@toptek
Unless you have fan pointing on S3, removing the cover may do more harm than good. Point of cover is to force air through heatsink fins.
OK, i removed it once it seemed ok . but then again i also push pull the fans. then why does the upgrade run better in open air over the closed one . well any way some thing he can try to see .
so ILL reword it take off the cover and run some fans on the S3 blades .I can give all kinds of advice you can try but the main one lower the OC to start, to see. then go with a new PSU . I won't give much advice on OCing other then don't unless you know what your doing .