Chrispy_ wrote:3440x1440@100Hz is a lot of bandwidth. Are you using the right-spec cables, and are they shorter than 6 feet?
That refresh/resolution combination is on the way to 20GBit/s and you're going to need at least a DP 1.2a cable to handle that, probably a short one to ensure the bandwidth isn't going to be reduced by interference.
Test it with Freesync off, too - I've seen flickering caused by bad monitor firmware that was glitchy for freesync.
DPete27 wrote:Not saying you should give up, but Powercolor has good customer service in my past experience. If you run out of options, it's RMA time. Let them decide if their GPU is faulty or not.