AMD 8150 dual 7970

System:

AMD Bulldozer FX-8150 3.6 GHz
2X Gigabite HD 7970's
seasonic 850W PSU
1000watt UPS
Asus Crosshair V Formula
16GB G.Skill 2X8Gb 1600MHz
Noctua NH-D14 dual radiator coller
128GB SSD
1TB HDD
NZXT Phantom Case
27" Asus LED monitor


Hey I just wanted to know whats the best way to overclock and stabilize this system i wanna be able to use the crossfire without bottlenecking. Any ideas?????

Thanks.