Working bat file for Nicehash Beamfor AMD cards :

@echo OFF
REM Change the following address to your BEAM addr.
SET ADDRESS=32cNmMwP91fUi1AJ667vq6WVyiw84M6KuV
SET USERNAME=%ADDRESS%.w
SET POOL=beam.usa.nicehash.com:3370
SET SCHEME=beam
START "Bminer: When Crypto-mining Made Fast" bminer.exe -devices amd:0,amd:1,amd:2,amd:3 -uri %SCHEME%://%USERNAME%@%POOL% -api 127.0.0.1:1880

amd:0,amd:1, - you need to specify each card in Riga