question regarding amd 7950 Crossfire

Hi , i have one Amd 7950 hd and i want to crossfire it with another 7950 hd. Currently i have seasonic 750W ( SS-750JS PSU ). So is it sufficient to power 7950 crossfire ?

My specs

amd phenom x6 1090t
asus m5a97
gigabyte 7950hd 3 gb
gskill 8 gb ram


thanks