The most notable upgrades to the Corsair Professional Series HX850 power supply are increased efficiency (80 Plus Gold versus 80 Plus Silver) and the ability to run in silent, fanless mode when the load is 20%. The HX850 PSU delivers very good efficiency with good voltage regulation and clean DC outputs on the all-important primary rails. The HX850 is dead-silent when outputting less than 20% load and under normal operating conditions the power supply is still very quiet."
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips