IOGear GCS1204 - Manual (Page 39)

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Video Specifications
DVI-D:
2560 x 1600 @ 60Hz (Dual Link);
supports Apple 20”, 23”, 30” Cinema Display;
supports Viewsonic 22” LCD monitor
DVI-A:
2048 x 1536; DDC2B
Supports Special monitors to 3840 x 2400 @
13Hz (Single Link);