I wanted to buy the HP Pavilion 550 PC. It has a AMD Kaveri CPU , and a 300w PSU. I wanted to swap out the PSU for a new 500w PSU for it. It needs to be able to easily use the GTX 750 Ti or GTX 960 , and have a 80+ rating. I'm not sure what kind of PSU to get , it says it has a uATX PSU so yeah. Thanks for the help!