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DVI doesn't have the pixel clock bandwidth for that resolution and refreshrate and Freesync can't be used with DVI.
With the current 16.8.1 drivers you need to enable GPU Scaling in the Radeon Settings / Display section in conjunction with Freesync for it to work. That issue is currently being worked on. That is only if you are able to enable Freesync first though.
As far as I am aware if you have enabled Blur reduction in the monitor OSD Freesync will be unavailable.
The BenQ XL2730Z monitor also has a firmware bug which other monitors don't have which causes things to go wonky and you would need to reset the monitor to factory defaults every now and again. Doing that will most likely get Freesync to show up again if you aren't using Blur reduction.
My XL2730Z also is showing Freesync unsupported, and I just took it out of the box and installed newest drivers from the website. I have ensured that blur reduction is not enabled. It is connected over display port and enabled to 144 hz
Radeon Software Version - 16.10.1
Radeon Software Edition - Crimson
Graphics Chipset - AMD Radeon R9 200 Series
Memory Size - 4096 MB
Memory Type - GDDR5
Core Clock - 1080 MHz
Windows Version - Windows 10 (64 bit)
System Memory - 16 GB
CPU Type - Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz