Someone share plz nums. of giga rx 470 4gb. Am i only one getting 210 from it 
My Rig With 3xGiga RX470 4GB showing 205 / 220 / 210
All cards are:
GPU 1200mhz - 1000mV
Memory 1650mhz - 950mV
-25mV offset
16.9.x to 16.11.x, other drivers check bios signature, resulting in error 43 in device manager. Only issue for modded bios though.
Using 16.11.5, tried 16.10.3 and now will try 16.9.2... always got exclamation mark on one of card
If it works sometimes, then check PSU, voltages, clocks, and temps.
Your clocks/volts should be fine, you can try lowering intensity, or using 8.0, or Ethereum.
Also, try reseating cards in risers, or swap risers.