The power supplies are from the stock of a friend of my friend. The CX650, is an unused PSU but has been in the box for 5-6 years, the be quiet! is bought some time ago but also unused. Now I have in this computer a power supply bought together with the case. It is a POWER LC420-12 V2.31 office series 80 plus bronze. Due to the fact that this computer is intended for everyday use with the option of multimedia and simple games, I do not want to invest in some monster "gigawatt" power supply, but rather in a proven, stable reliable model, with the possibility of upgrading the computer with some current mid-range graphics card.