if you don't mind all blue screen, no matter what you choose, its all blue.

you can get 640x870 with the onboard graphics with this combination on your Mac to vga adaptor.

[attachment=1]Screen Shot 2014-01-11 at 6.44.16 PM.png[/attachment]

[attachment=0]Screen Shot 2014-01-11 at 6.45.47 PM.png[/attachment]