Unsure if my current PSU will run this...

My current PSU (AX500-A) has the specs: 3.3V@30A, 5V@28A, 12V1@15A, 12V2@15A, [email protected], 5VSB@2A, with a maximum combined wattage of the 12V rails at 285W.

My planned system and overclock: brisbane [email protected], HD 3850, 2GB crucial ballistix DDR2 800@950, Biostar 550SE

Do you think I will run into any problems concerning the power supply?

i doubt it. two rails added together is 30amps, which should be enough for a 3850.