I'll put it to you in words that make sense hopefully.

Buy the biggest wattage and name brand PSU you can afford. The PSU will be taxed on the demands it is capable of when "needed". If your PSU demands are over exceeded or burdened too long at the top end, it will start to falter. Just don't buy cheap or fall for over-rated PSU labeling. Read the fine print and specs to see what it delivers and look fore the 80% approval certification. if you check your system demands and find it uses X-wattage, then add 100W to it, then look for that wattage PSU as a guide.

Because, you plan on gaming or other multi-media needs, be sure you system is well cooled. Review similar posts here on the forum and its been well stated on what to do. finis

tada -----Willy Happy