Re: Two 30" 2560x1600 in Twinview??
After going through our supplier it is indeed true that only G80 based hardware can run a Twinview buffer up to 8192x8192.... any card based on older designs (like the FX3500) is limited to a 4096x4096 buffer... which is just short of the 5120x1600 buffer that I needed.
I have now setup the card to use two X screens along with Xinerama which allows you to work around this issue (although I think I am losing some performance... but at least it works!).