We are running Symphony 5.1.1 Meridien on a Compaq W8000. We recently rebuilt our machines due to a virus we could not cure.
We are also using the Nvidia Quadro4 980XGL Video card. The driver should be in:
C:\Program Files\Avid\Utilities\Nvidia
or you can download the latest drivers from:
https://www.nvidia.com/object/avid_cert_drivers.html
We are currently using the 77.18 driver which seems to work OK for us and are using the default display settings.
Hope this helps,
Ken