Been wondering the same thing myself. I'm still using a TX850 so I would have to up my PS as it's MAXED out. Pulling 1100w from the wall while doing full load tests. Someone said that a 1500w would be needed to add another 290 to my rig. I've been thinking of just trading out the CF 290s for a Fury X. Then buy another Fury X down the road. If you do get another 290 let me know how it works out.