I see the maximum resolution of the DH57JG in the manual with conflicting information.
Digital Visual Interface (DVI-I) : "The maximum supported resolution is 1900 x 1200 (WUXGA)"
VGA Displays: "The maximum supported resolution is 2560 x 1600 (WQXGA)"
I have a dual link Dell 30" monitor but can't tell if this motherboard will support it at 2560x1600. It doesn't make sense that the higer resolution is under "vga displays" and not the DVI section either.
I guess I have my answer. I tried one of the boards and it appears the DVI-I is not dual-link which limits the resolution. Hopefully it can be added with a bios update and won't require a new board revision. So 1920x1200 is probably the maximum digital resolution.
If you have a monitor requiring a dual link you'll probabably only get a maximum of 1280x800 as I did with my Dell 30" monitor.
Still, there is no way the 2560x1600 resolution is correct for analog vga.