My computer is roughly 7 years old with the same power supply. I dont know the power certifications or the wattage, but I believe it doens't have a power certification. My power suppy is very loud when I power it on, and occasionally makes a clicking sound. It doesn't have a single vga (PCIE connecter) and a 2+2 cpu power connecter. Should I replace this unit, or leave it running for another few years before I replace my computer?