New rig will this psu/gfx combo work?

bob s

Aug 21, 2009
I am looking to upgrade this winter. I had previously posted in a different forum about using a gtx275 card. But givin the august '09 list i was thinking of switching that to a 4850x2 instead. I have a 850w thermaltake toughpower with 62A on the 12v rails. will this be enough?

Full specs are
Crossfire III 790FX
phenom II 955 BE
radeon HD 4850x2
1TB SATA Seagate HDD
4 120mm Fans
1 DVDRW and possibly a 320gb IDE HDD.