Video Cards + MicroBoard B400 Monitor + Freesync

Hello all
First a little backstory… had a 980TI that blew up (literally), Dell had a sale on a xlr8 PNY 1080Ti OC card that I bought, went on back, order still haven’t received it, but they took 10% off.
RX Vega 64 is releasing soon, for the same price or 100$ less…

Now to the MicroBoard B400 UHD HDX, it’s been a while and the monitor has been great but the last video I saw said that the freesync didn’t work to well… and it needed a software update.

So my question(s) is…
Do I go for the Vega 64 and use freesync on my monitor?
Would freesync be worth it getting a less powerful card?
What is the range of the freesync for this monitor? How do I find out?
Is / was there ever a software update?
Or should i just stick with the xlr8 PNY 1080Ti OC?

Ty to all for any opinions and or help