I have 820 Hs with Rx 480 4Gb Nitro + 1306/1750 default clock, elpida memory, after mod bios set @1306/2050 about 820H/s
Just had a client, 470 4G Hynix, 880h, core 1275, mem 2050

Edit: Shoots over 900 with core clock at 1350..
Hynix is better than Elpida.