Thank you for those suggestions. When it comes to power supplies are you limited to what you can put in a machine by any other components? I am wary of doing anything that might compromise the other hardware or cause overheating etc?
I already installed this unit in my old pc would it be compatable with my new computer?
If you intended to use the Gtx550ti, this card requires minimum 400W & continuous current rating of 24 Amps in single +12 rail, your "CIT 600w psu " has dual rails of continuous current rating of 18 Amps each only even though it has 600 wattage.
Don't be so focused on the power supply's wattage. Meeting the minimum +12 Volt continuous current rating is much more important because if it is not met the CPU and graphics card won't function properly no matter how high the power supply's wattage is.