Recently I bought a Nvidia GTX 560 to upgrade my graphics in my dell inspiron 620 along with the graphics card i bought a thermaltake 630W power supply within two days this power supply failed completely the computer crashed and would never power on again I put my old dell power supply back in and the computer powered up fine. While waiting on my replacement power supply I found a 500W PC Power Cooling power supply at my work i thought this would be enough until my replacement came in well the same thing happened I had this power supply for about two days and it burnt up and the old power supply works like a charm the only draw back as it does not have PCI-E support