My specs are
--ASRock | i7 5820k @ 4.0ghz | Sapphire R9 Fury X 4GB | 16GB GSkill DDR4 @2800mhz 15-15-15-35 2T | Thermaltake 1200w
--Monitor: Acer XG270HU 27" 2560x1440 Freesync 144hz
Freesync should work on this monitor with framerates between 40 and 144 with v-sync enabled or not. But for some reason since Crimson and Relive drivers I have been unable to get freesync to work with v-sync disabled. The Windmill demo is the only program that Freesync works with v-sync disabled for me. Some games cap fps at 60 with v-sync enabled so it's kind of important to be able to disable v-sync in these games and have Freesync enabled to eliminate screen tearing. It just doesn't work for me. Any suggestions or people who have similar problems with freesync not working correctly? Not sure how to troubleshoot this anymore. Might just need to send in another bug report and hopefully it will get looked into.
I have the same issue with the same card. My Monitor is Benq XL2730. Freesync worked for me quite a while, but with one of the radeon driver updates i experience tearing in every game with v-sync turned off.