what is the difference between gold and bronze power supply?
Below 800W, Bronze certification adds 4-20% to the list price of an 80 Plus unit. 80 Plus Gold PSUs are 35-61% more expensive within the same wattage category. Platinum-level power supplies are 90-100% more expensive; twice the price of a standard 80 Plus unit. ... An 80 Plus 1200W PSU is $229; 80 Plus Gold is ~$258.