Originally Posted by The_0ctogon
I haven't had the opportunity to compare GSYNC with and without module first-hand, but on paper at least the GSYNC module does have advantages, e.g. variable overdrive. In this case, too, the XB273K PB (module) supports 144Hz, GSYNC, and HDR all at once (using a single cable even), while the XV273K and XB273K GP (no module) don't.
With all that said, I actually just ordered a refurbed XV273K for the exact same price ($699+tax) I got my XB273K PB. I'm going to compare them side-by-side and go with the XV273K if image quality is the same and I'm able to get 120Hz, FreeSync, and HDR at once out of it. This is because I currently have an AMD GPU and don't know when/if I'd get an Nvidia one to make use of GSYNC. I also want the additional DP1.4 port on the XV273K and prefer the plain Acer logo over the (IMO tacky) Predator logo on the XB273K PB.
I have an XV273K since its launch and I used it with tons of HDR contents and tons of HDR Games using Variable Refresh Rate.
Differently from what reviewers says, this monitor works well with HDR, 120Hz and GSYNC (VRR).
You can't enable HDR and GSYNC at the same time from the minitor's OSD, you need to use Acer Display Widget to do it.
Basically you enable GSYNC on the OSD and then enable HDR with Acer display widget software.
It works awesome.
So, I still prefer the XV273K to the XB273K, it's cheaper, it works with Nvidia and AMD and sincerely I don't want to have a closed standard even on the monitor.