[ubuntu] Ubuntu 12'10 32 sees GeForce 9500 GT but not the other GT520 I have both installed

I run a quad core Asus desktop with 2 video cards installed Windows can handle this easily. I use 3 monitors and have capacity for a 4th. Each video card has 2 HD outputs. Ubuntu sees the main first video card and I have duel monitors working on the one 9500 GT Nvida card with no problem. I want to enable the second video card GT 520 Nvidia as well for the 3rd monitor. Is this possible?

I have been looking and can not find an answer.