Thanks for the advise. I'll look into getting a better power supply. I already tried to set my memory to +600 and was having issues. currently, I am at +350 and will keep pushing it little by little to see how far that I can take it.
I am pretty sure it's a PSU issue. When you want to buy a new PSU keep in mind that you will use it's 80% capacity. For example, an 80+ Gold rated 1000W PSU will give you 80% efficiency. In other words you will be able to utilise 800W from it.
Actually the typical efficiency is about 90-93% at max loading, but for me I also push it just at 80% power limit for stability and safety in long term operation.