I have a Dell GX260 and want to add another monitor. What is the dual video card that is needed to do this, or is there an easier way to do this?
According to the specs I found (http://support.dell.com/support/edocs/systems/opgx260/en/ug/specs.htm#1110653)
You have one AGP slot. You won't be running dual graphics cards this way.
Unless I have the wrong model, this PC is quite outdated so I'm not sure why you'd want dual monitors.
The most powerful card you could get for this system would be the HD 4670; I am uncertain if you could drive multiple monitors this way but likely this is not possible.
These cards appear to be full sized cards:http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007709%20600007850%20600007317&IsNodeId=1&name=Radeon%20HD%204000%20series
I am not sure which form factor you have, Dell has 3 form factors listed. Small form factor, small desktop, and mini tower are listed.Two of those can only take low-profile/half length cards. Your options are quite limited, sorry to be a naysayer but I think you'll be better off saving for a new system as opposed to getting another monitor. That's my recommendation anyway.