Here's a list of Freesync supported cards:
AMD Radeon™ Pro Duo, R9 Fury X, Fury, Nano, R9 390X, 390, 295X2, R9 290X, 290, R9 380X, 380, R9 285, R7 360, R7 260X and 260 GPUs
Here's a link to the source:
https://community.amd.com/docs/DOC-1432
I hope that helps!