Hey Toe, Punch all of that stuff into pcpartpicker and see if you are at half the psu usage. Rule of thumb i have followed is you should have a powersupply double to the amount of wattage your system pulls, for efficiency sake.
Also, you might have a bad memory stick potentially, which could cause systems of that.
What OS are you running and / or see if you can run windows updates? What processor cooler, stock assuming?