Ok, Thanks ALL! I bought The green 650w unit. and my machine is back up and running. ...and yes I have enough devices to require around 530w. I have a small case but enough bay space to put the cables out of the way by using a few wire ties. I wanted to get the 650 also because it had the 2 PCI-E on the unit without an extra adapter. All is running fine. Have a GREAT DAY !!