Mcninjaguy

please read power supply selection in my signature

sure your PSU is givingout enough wattage but it's being stressed out
When I recommend a PSU I take a couple things into consideeration

-longevity of computer
-quality of current PSU
-capacitor aging and a safe range of wattage.
-your current components

When selecting a power supply you need to take what the minimum needed is and times it by 50% and add 30% for capicator aging

so with your current computer your PSU is being stressed and is working at around 90% capacity when a game is on. That won't help your computer stay stable. Preferably when your gaming with your computer the PSU should be working at 70% or less or ideally 60% or less.