I give up on trying to fix this issue on my own. I'm turning to the community for help.
Here's the deal.
HiveOS running Phoenixminer 5.6d with 6 RX 5700XT Sapphire Pulse cards.
They're running really hot! They all have the exact same memory type (Micron) and are all flashed with the exact same bios.
My tuning commands are simply: -tt 90 -fanmin 95
My clocks are as follows: (these seem to be the most stable and optimal during the Spring/Summer months)
FAN 99
CORE 1400
VDD 800
MEM 910
MVDD 1300
VDDCI 800
Now some cards are running at 57MH/s. That's fine. That's what I want... at minimum. Those temperatures are 68 Core and 102 Memory.
But others are 50MH/s and temperatures are 74 Core and 106 Memory. So I'm chalking it up to thermal throttling.
Okay. So let's boost the fan speeds... but the fans are already set to 99%. But HiveOS is telling me that the fans are only running at speeds between 81% - 88%. No where near the 99% that I've set the command (-tt 90 -fanmin 95) to.
Where did I screw up?
Drivers 20.40
Kernel 5.4.80
OS Ver 0.6-203@210519
You're really pushing the limits of those 5700 xts. I have 6 5700 xt red devils running:
1350 gpu/850 volts/885 memory, and the memory timings from 1500 MHz. I'm getting about 54.7 mh/s. Fans run ~24% with temps in the low to mid 50s for the gpu (I'm on ubuntu so I'm not sure of the memory temp). They are rock solid. That is slower than your top, but about the same considering your throttling.
It's up to you, but your only option is to scale back your memory or open them up and put in better thermal pads. (I'd suspect your cards would last longer too.)
It's all about winning or losing the silicon lottery. It's hard to treat them all the same.
My HiveOS settings for my RX 5700 (non-XT) Red Dragon are core: 1380, dpm: 5, VDD: 780, Mem 905. With the above settings I get a steady 55+ MHs at 100w. This is with the BIOS mod (copypasta memory timings). On TeamRedMiner, I get 44.8 MHs at most but have to bump up mem to 910.
It's about 36-40C outside my house right now and my fan is set to 80 but rarely gets there (usually at 78 most). I have a box fan pointed to my rig which blows the hot air to a window.