I am currently tyring to set my res to 800x480 and have had no luck can anyone help. I have tried using powerstrip and no luck.
If you can provide an EDID or a Linux Modeline, it should be trivial to get it to work. If you want a quick and dirty way of getting this data, use http://www.entechtaiwan.com/util/moninfo.shtm
on your monitor.
If you can't get this to work, it can possibly still be done, it's just much harder.