I have an FV25 mobo with the onboard video and was unable to run 800x480 resolution even using PowerStrip (custom resolution was faded out so I couldn't select it). Anways, I tried one of my old Voodoo3 2000 PCI cards and it works perfectly! I'd suggest just trying a crappy standalone card instead of onboard and it just may work.
No announcement yet.
Easy Solution to 800x480 res prob