Hi Xinrag, most of our testing has been done with Hawaii (290/ 290X) and Fiji (Fury X/ Nano) cards. Earlier GCN cards like the Tahiti based 7950 should work but have not been through extensive testing. 
Which driver version are you using? And have you tried creating a custom resolution in the driver interface? 
If that’s not working, there is a firmware update available for the 1070/ 1170 which enhances EDID reading and compatibility. Can you send us a short email at [email protected] or leave your email address here than our support team can forward you the new firmware + instructions for update. Thanks!