Try copying 1750 timings to 2000. Safer bet, especially if samsung memory.
Why does everyone say that you can go with lower straps on other chips, but Samsung needs to be 1750+?
Samsung straps are more tightly tuned from the start. Generaleramon already put in WEEKS of work tuning the individual timings on Samsung memory, so don't bother just upcopying straps and see his "Uber Mix 3.1" under "RX480/580 Performance Timings" and send him a thank you: