I had the CV64/3D im my A2000 and even in a A1200 at one point a long time ago, but now I just have AGA so my memory is a little foggy, but there is a utility that come with CyberGraphicX that allows you to define new modes. You set the resolution, frequency, dot clock, doublescan, etc...
While you are making modes, may as well make a 320x200 and 320x220 as I don't think they exist by default. I think I made those by cloning the 640x480 and changing it to 320x200 and turning on doublescan. With that you can play some games on your GFX board.
I think you may need to reboot before new modes are available.
NICE A4000T
I would get in on this preorder if you don't have a network board
http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=1156
