XFX RX 570 4 GB (BIOS v.015.050.002.001.000000)

RS Black Edition

BIOS date: 2017-04-19

Device Id: 1002 67DF

Subsystem Id: 1682 C570
113-57045EHB1-W90
D00034 Polaris20 XL A1 GDDR5 128Mx32 4GB 300e/300m

Memory Support
4096 MB, GDDR5, Autodetect 
4096 MB, GDDR5, Elpida EDW4032BABG
4096 MB, GDDR5, Hynix H5GC4H24AJR

Memory Timings (Elpida)
tRCDW-tRCDWA-tRCDR-tRCDRA-tRC-tCL-tRFC
200 MHz: 0-3-2-3-7-7-12
400 MHz: 0-3-5-5-15-8-25
800 MHz: 5-5-11-11-31-12-51
1000 MHz: 9-9-14-14-39-15-64
1250 MHz: 13-13-18-18-50-18-81
1375 MHz: 15-15-20-20-55-20-89
1425 MHz: 16-16-21-21-57-20-92
1500 MHz: 17-17-22-22-60-21-97
1625 MHz: 19-19-24-24-65-22-105
1750 MHz: 21-21-26-26-70-23-113
2000 MHz: 24-24-29-29-79-25-129

Memory Timings (Hynix)
tRCDW-tRCDWA-tRCDR-tRCDRA-tRC-tCL-tRFC
400 MHz: 4-4-5-5-18-7-39
800 MHz: 7-7-11-11-34-10-79
900 MHz: 9-9-12-12-38-11-89
1000 MHz: 9-9-13-13-41-12-98
1125 MHz: 11-11-15-15-47-13-111
1250 MHz: 12-12-17-17-52-15-123
1375 MHz: 14-14-19-19-57-17-136
1425 MHz: 14-14-20-20-59-17-141
1500 MHz: 14-14-20-20-61-18-148
1625 MHz: 16-16-23-23-68-18-164
1750 MHz: 17-17-24-24-72-19-173
2000 MHz: 19-19-27-27-83-19-1