1 Resolution

1440x990 is 1296000 pixels screen.
A full screen 24-bit image means that each pixel uses 24 bits.
A 1440x990 screen uses 129600024 = 31104000 bits for a single frame.
A refresh rate of 75Hz means 31104000 75 = 2332800000 bits/s = around 2 gigabits per second
A CPU would need a 2GHz clockrate to view a 1440x990 resolution screen.