Questions
Q1
Will my H67 motherboard support 2560x1600 resolution display?

Here are the resolutions for H67 motherboard display output.

Disaply port will be able to support 2560x1600 resolution with 60 Hz.

HDMI and DVI port will support up to 1920*1200 resolution with 60 Hz.

D-Sub (analog) display will be able to support up to 2048*1536 resolution at 75 Hz.