Nvidia QUADRO G-SYNC II User Manual page 36

NVIDIA Quadro G-Sync II User Guide
House Signal
Sync Pulse
This action overrides any refresh rate that you may
have selected from the refresh rate list.

Generating a Sync Frequency Faster than the External House Signal
You can double the sync frequency by triggering the sync
pulse off both the leading and falling edge of the source
sync signal. This works only with TTL level signals.
Click the Sync Edge list arrow and then select
both leading and falling edges.
House signal
Sync Pulse

Detecting the Incoming Signal Type
Quadro G-Sync II supports the following
external synchronization signal types:
 TTL (3.3 volt level)

Composite Bi-level (NTSC or PAL sources
use bi-level composite signals)

Composite Tri-level (HDTV sources commonly
use tri-level composite signals)
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Outgoing Sync Interval value of 1
Outgoing Sync triggered from leading and falling edge