To check which EDID is used
From the NVIDIA Control Panel Select a Task pane, under Workstation, click View system topology.
Locate the display with the EDID that you want to save, then click he corresponding Display [+] icon to expand the branch.
Check the EDID Source.
"Monitor" indicates that the actual monitor EDID is used.
"File" indicates that you are applying an EDID from a file to that connector.
"None" indicates that no EDID is applied for that display.