You can be pretty sure that there is no ultrawide on the market with great uniformity, and also blank screen doesn't matter, it is not possible to notice it in normal usage, and also it is visible basically only on white and gray. Getting bothered by something like this is just intentional looking for issues that have no impact on actual usage. Although it will vary a bit from unit to unit, it is very hard to get it on screenshot properly, same as bleed, you just need to know for yourself.
DP 1.2 enables DisplayPort 1.2 features that required for FreeSync to work properly. It gets enabled automatically when you enable FreeSync and you cannot turn it off while using FreeSync. It doesn't seem to have any impact on usage without FreeSync, but leave it on.
Edited by Krzych04650 - 4/23/17 at 8:44am