Is 600w Enough For an R9 390 ?



It's recommended to have 650W for a rig built on an R9 390 based on this PSU Requirement Chart. Note that it takes into account the other components powered by the PSU already with some additional headroom.

Here are some suggestions, which are cheaper than your initial selection (but listed in either the Tier-1 / Tier-2):

XFX TS 650W 80+ Gold Certified ATX Power Supply ($64.99 + $25 Rebate @ Newegg)

EVGA SuperNOVA GS 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($69.99 + $20 Rebate @ NCIXUS)

Rosewill 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($72.00 w/ 20% off promo until 9/24/2015 @ Newegg)

Hope this will help.