To all owners of RX 6700 XT, 6800 (XT) and 6900 XT cards that mine with their cards under Windows: HiveOS has a bug which causes the core voltage to get stuck at a certain voltage. For the RX 6800 this is 781mv. However, in Windows 10 these cards can run at 625mv!
I did some testing and in HiveOS the RX 6800 runs at about 150-160 watt at the wall with the settings in the screenshot. The VDD (core voltage) is set to 630 which is the lowest stable voltage for mining in Windows with these cards for me. But in reality the voltage is 781mv as TeamRedMiner shows here:
In Windows 10 when I run the cards at 630mv, TeamRedMiner shows 625mv. The cards run at about 120-125watt at the wall which is a huge difference. HiveOS told me at first that this isn’t possible in Linux. Then I found out SimpleMiningOS does support lowering the core voltage. SMOS however does not support lowering VDDCI and MVDD allthough they told me it is on their to-do list. So it is possible and HiveOS could change this and solve this bug for us.
I myself build a small temporary rig for my RX 6000 cards which is fine for now (and even has better hashrate in Windows 10). But I would love HiveOS to support core voltage adjustment below 781mv. Which saves about 30-35 watts per card making these cards very efficient! That way I can add them to my main rig.
My experience is only with RX 6800 cards because I did not mind testing 6700XT in HiveOS as they run fine in Windows. But this is an issue that should be addressed. So to all owners of 6000 cards, ask HiveOS to solve this bug in HiveOS and make HiveOS the perfect OS for mining with 6000 series cards from AMD!