i just bought new computer parts, and right now i know my PSU is JUST enough.
ROG VI Extreme
g.skill CL8 8GB
Antec Water cooler
4 HDD and one SSD
Antec HCG 620W
The minimum for my card is 600W. I've been recommended a Corsair PSU but I'm not sure what the difference between the AX, HX and RM series is.. I'm looking for 850W. What should i get when playing high gaming specs like Metro 2033, Planetside 2 etc
The power supply you have is adequate for your system. You really don't need a new PSU.
AX series (most expensive) is 80 plus platinum certified
HX and RM series are 80 plus gold certified
HCG is 80 plus bronze certified.
These are all good ratings, but gold is more efficient than bronze and platinum is more efficient than gold.