friends the x 34 is "lemon", too many qc issues, give a look to hardforum or overclock.net forum or the same acer forum.
I've just resend an x34 (mine was the freesync) to the shop where I buyed one.
or at least pretend to have checked units before shipping.
The only issue with it is that it isn't IPS and most importantly it's a 1080P panel. That thing will drop naturally so why not get the stupidly expensive one on the drop and see if we can get it below that magic $800 number!!!