CPU- most games prefer higher clock speeds and a greater IPC, so for now intel is the king for gaming class cpus.
A good rule of thumb is, intel for gaming, ryzen for workstation, multitasking, and content creation
PSU- Continuous Wattage and Peak Wattage are ratings based on tests by the manufacturer. Continuous Wattage indicates that it can deliver those 500W continuously without fluctuations. Peak Wattage indicates 500W is the maximum power it can deliver, but probably only for a minute before dropping down. In simple buyer terms, look for continuous wattage ratings, ignore peak wattage ratings, and ignore a product that doesn’t advertise its continuous wattage rating. If you can’t tell which one it is, don’t take your chances and just move on
an 80% efficiency indicates it’s able to convert 80% of the AC power to DC while 50% efficiency indicates it converts 50% of the AC power to DC. In even simpler terms: a higher efficiency percentage is better and will require less power from the outlet.
See how your PSU stacks up at http://jonnyguru.com/