Antec are a good quality PSU brand, brushing shoulders with Corsair/XFX. And the good news is that the 5750 is one of the best performance for low power consumption cards you can get. It only uses 1 x 6in PCIE connector(alone supplies 75w), and needs a
Maximum board power of 86 Watts . Your
Intel® Core™2 Duo Processor E4500 only needs 65w at full load, and you are using a minimum practical amount of drives, which dont use that much power themselves. And using a
PSU Calculator I would conclude your PSU is good enough on this occasion
