Samsung SyncMaster XL30 Owner's Manual page 25

Preset Timing Modes
If the signal transferred from the computer is the same as the following Preset Timing Modes, the
screen will be adjusted automatically. However, if the signal differs, the screen may go blank while
the power LED is on. Refer to the video card manual and adjust the screen as follows.
Display Mode
VESA, 1280 x 800
VESA, 2560 x 1600
Horizontal Vertical
Frequency Frequency
(kHz) (Hz)
49.306 59.91
98.713 59.972
Horizontal Frequency
The time to scan one line connecting the right edge to the left edge of
the screen horizontally is called the Horizontal Cycle and the inverse
number of the Horizontal Cycle is called the Horizontal Frequency.
Unit : kHz
Vertical Frequency
Like a fluorescent lamp, the screen has to repeat the same image
many times per second to display an image to the user. The
frequency of this repetition is called the Vertical Frequency or Refresh
Rate. Unit: Hz
Pixel Clock Sync Polarity
(MHz) (H/V)
71 +/-
268.5 +/-