All settings for SRBMiner are the same for each Vega 56 and done in the V8 config file:

intensity: 112
worksize: 16
threads: 2

Vega 56's #1, #2 and #3 are in one system that has Radeon Adrenalin Edition 18.8.1 installed which actually produces high hash rates than the recommended Radeon Adrenalin Edition 18.5.1 installed in the system with Vega 56's #4, #5, #6 and #7.

These two systems are on a Biostar H81A motherboard and are using a single HP 1200 Watt Server Power Supply (87% Efficient) with a 17x 6-pin Breakout board. The motherboard is powered by an 180 watt Pico PSU that gets it's 12 volt input from a 6-pin connector on the breakout board. I like my systems only running on a single power supply.


System one is hashing on an  i3-4340 at 73 H/s and system two is hashing on an  i5-4570 at 195 H/s.

All power measurements are done at the wall with a Power Usage Monitor. That way the entire system is measured (motherboard, processor, memory, ssd) and the Vega 56's and it is the real power not the incomplete ones that only look at the software measurements like HWINFO which does not consider the inefficiencies of power supply and internal power conversion circuits or the rest of the system.

Realize that V8 is much more power hungry than V7 was.

I do not use soft power play tables as I have found that V7 and V8 basically run between P6 & P7 states on the core and P3 on memory. The Vega 56's are reference designs of various vendors with stock BIOS.

So my Wattman settings for six of the Vega 56's are:

Core:
Min P6 1212 MHz @ 905 mv
Max P7 1452 MHz @ 925 mv

Memory:
Min/Max P3 935 MHz @ 900 mv

Fans:
Min: 2700
Target: 4900

Temperature:
Max: 75
Target: 65

I do have one problematic Vega 56 that I have to run at:

Core:
Min P6 1212 MHz @ 960 mv
Max P7 1452 MHz @ 985 mv

Memory:
Min/Max P3 900 MHz @ 950 mv

With all that out of the way here are the final numbers:

System one 3x Vega 56's:

Vega #1 1911 H/s
Vega #2 1893 H/s
Vega #3 1904 H/s
--------------------
Total  Vega's 5708 H/s
i3-4340 adds 73 H/s
-------------------------
System Total:  5781 H/s

Total Power at the wall: 675 watts


System two 4x Vega 56's:

Vega #4 1869 H/s
Vega #5 1865 H/s
Vega #6 1874 H/s
Vega #7 1863 H/s
--------------------
Total  Vega's 7471 H/s
i5-4570 adds 195 H/s
-------------------------
System Total:  7666 H/s

Total Power at the wall: 898 watts

V1.6.9 vs V1.7.0 V8 comparison on my 7x Vega 56's


Vega #1 1891 1910 + 19 H/s
Vega #2 1871 1893 + 22 H/s
Vega #3 1884 1904 + 20 H/s
Vega #4 1852 1869 + 17 H/s
Vega #5 1844 1865 + 21 H/s
Vega #6 1855 1874 + 19 H/s
Vega #7 1840 1863 + 23 H/s
---------------------------------
Totals   13037 13178 +141 H/s or about +20 H/s for each Vega 56


Thx doc !~!