Vertical Frequency can be set up when outputting to External Monitor..
Resolution
640 × 480
800 × 600
1024 × 768
1280 × 1024
(Virtual)*
1440 × 900
1600 × 1200
(Virtual)*
1920 × 1440
(Virtual)*
2048 × 1536
(Virtual)*
User's Manual
Table 2 Video modes (SVGA)
LCD
colours
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
Display Controller and Modes
CRT
colours
frequency (Hz)
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
256/256K
Vertical
60
75
85
100
60
75
85
100
60
75
85
100
60
75
85
100
60
75
85
100
60
75
85
100
60
75
85
60
75
B-4