I contacted Robert Hallock from AMD regarding 144hz flickering and he got back to me with this answer a few months ago. It took him a few days to get back to me after testing the monitor, great support from AMD.
Hi, Daniel. We have this monitor in our lab and took a look at the firmware of the electronics for the display. Our analysis reveals that this monitor’s firmware is not compliant with a VESA certification called Coordinated Video Timing (CVT). The CVT timing standard provides a common framework for a graphics card and monitor to reliably communicate, especially at high refresh rates or resolutions (e.g. 144Hz). Failure to follow the standards set forth in VESA CVT specification can cause interoperability and visual errors, like the one your are experiencing now, or common errors like “DisplayPort link failure.”
Unfortunately there is not much we can do on our end to resolve this problem, as it is a firmware issue with this particular display.
Sincerely,
Robert
This monitor was designed for Nvidia to achieve 144hz with GSync and stuff and this is possibly why it won't go over 120hz on AMD cards, I think they tinkered with the timings to achieve this in the Monitors firmware.
I am able to use the 120hz perfectly fine though and I am happy with that as Mantle is just awesome with this monitor, AMD Mantle even with Vsync rocks specially with Crossfire as each GPU renders each frame consecutively and with AMD's great frame pacing even while playing BF4 at 135% resolution scale there is no lag what so ever, in fact Mantle feels so much more responsive to begin with as frostbite 3 is going directly to the GPU and not needing the CPU for draw calls making it render sooner making it feel super smooth and responsive and makes it feel your connected to the game so to speak/
ASUS Maximus VI Formula - i7 4770K - H80i - MSI R9 Fury X - HyperX 16GB Ram - 250GB + 500GB Samsung 840 EVO SSD - Benq XL2730Z 2560x1440p 144hz Freesync - Seasonic 1000w 80 Plus Platnum...
