I got no dvd or bluray roms\writers and i only have few USB devices connected all the time (Bluetooth Dongle, Microsoft 360 receiver, headphones).
Do you reckon i am gonna need to upgrade my PSU as well?
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More aboutamd 280x power consumption
HD 7850 requires 21 Amps on the 12v rail & a 500W PSU minimum
R9 280X requires 30 Amps on the 12v rail & a 550W PSU minimum
IMO your more than fine, the XFX 550W has 44amps on the 12v rail. You invested in a good PSU & now you get the rewards.
Except doing the bare minimum is a good way to age that sexy fine Psu and cause ripples more frequently but hey, long as all the sensitive equipment isn't worth that much to you then go for it. (read sarcasm )