"If your Vega64 with Samsung mem. can handle tweak profile 10, then you will get some hashrate increase on it (thanks goes to Rednow, Gkumaran)"
Tried on 2 rigs - both with only samsung memory - on all 24 vega56 with 64 bios cards profile 10 not working - maybe a bug? on 1.8.6 not a problem with profile 5