Can confirm that 5.2c is working great with my RX 570 4Gb cards
Windows 10
Adrenalin 2019-Edition-18.12.3-Dec19 driver
2 x Sapphire Pulse Rx 570 4Gb cards mining ETH at 1100/2000 core/mem
hashrate now 29.9MH/s
hashrate before the DAG limitation: 30.3MH/s
Update:
Had to move to Linux (Xubuntu 16.04) after hashing speed dropped to 27 in Windows.
In Linux I am back at 30MH/s on both GPUs, guys

Using miner version 5.1c and AMDGPU-Pro 17.40 and kernel version 4.18 - old but trusty
Cheers,
#Sapphire rules #Phoenixminer rules
Linux my570 5.4.42-050442-generic #202005200734 SMP Wed May 20 07:36:21 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux