I have got fx8150 cpu with 2x amd raedon 4850 crossfire.I bought an molex to 6 pin cable. Cooler master 500w psu works fine for me.I think 500w will be enough for you.
CPU: INTEL I7 4770K @ 4.5 GHZ
AIR COOLER : ZALMAN CNPS14X
MOTHERBOARD : ASUS Z87 DELUXE-DUAL
RAM : GSKILL TRIDENT 2X8GB+2X4GB 2400 MHZ (24GB TOTAL)
GRAPHICS : ZOTAC NVIDIA GEOFORCE GTX 780
SSD DRIVES : 2X SAMSUNG 840EVO 120GB
HDD DRIVES : 4X3TB HDD , 4X1TB HDD , 2X2TB HDD - 12TB FIRMWARE RAID+8TB FIRM+SOFT RAID
CASE : AEROSTRIKE X ST
POWER SUPPLY : SEASONIC G-750 80PLUS
FANS : 9X120MM COOLER MASTER LED , 8X140MM XIGMATEK , 1X200MM AEROCOOL , 1X200MM COOLER MASTER , 1X120MM AEROCOOL