I'm setting up Dual Monitors on my HIS Radeon 4870 1GB GPU. This GPU has 1 x VGA and 1 x DVI output. I have two identical ASUS VW222u monitors. I have installed the latest ATI Catalyst Suite and drivers for this GPU and have Windows 7 up and running with BOTH monitors.
My issue, however, is my primary monitor (DVI output) is running at my ideal resolution of 1680 x 1050, but my second monitor (VGA output) can not run at this resolution. It is only allowing me to choose from a small specific number of resolutions, and 1680 x 1050 is not included (closest is 1600 x 1200, IIRC).
The ATI Catalyst Control Centre is telling me the primary monitor is my ASUS VW222u (Digital), which is correct, but my 2nd monitor is only described as a "Generic Non-PnP CRT Monitor", despite installing the correct monitor drivers etc.
Is this because I am running this second monitor of the VGA output? Will that cause my monitor to not be able to produce my desired 1680 x 1050 resolution? And will running it off the VGA output mean It thinks its a CRT?
EDIT: Had no problems with this on XP, only since upgrading to Windows 7