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Get the displayport mapping to the appropriate adapters. The X700 model is quite outdated and may cause driver conflicts with the RX6600, especially if it struggles to install the latest Vista drivers on Windows 10 or 11. Definitely a problem.
Are you attempting to link an older monitor that only has VGA and DVI ports to a PC running an RX6600? If yes, using a DVI-HDMI cable would be the most suitable option. I followed this approach when connecting my previous monitor to a PC with an RX580. Yes, the RX580 supports DVI, but I chose HDMI for convenience...