My HW errors are almost non-existent no matter what freq I pick but all 3 miners appear to max out in the low 440's. I tried 250mhz and it appeared to be running at 470 but then overnight the avg came down to like 450 so I went back to 218. This is with all 4 PCI-E plugged in so maybe firmware update or some more tinkering can push the numbers up a bit
I have 1 machine that prefers 212.5 freq
I have 1 machine that does well at 212.5 and 225 freq.
So there is a variance. I will run one at each.
It does appear that a good plat psu like a 1000 watt seasonic gives .75 watts a hash at the wall.
I was doing 846-850 gh and 630-640 watts with both at 212.5
The beeping occurs much less when set to false. I think a few things do it.
1) ssh in change the freq does 1 beep
2) gui boot does 1 beep
3) hw may do a beep not sure.
4) pool switchover does a beep