8 GPU Ethereum Mining Rig
For this build i used the following hardware
Motherboard: Asrock H270 Performance
CPU: G4560 Pentium
Ram: 4GB DDR4 Mircon
GPU: 8X RX580 4G Sapphire Nitro+
PSU: EVGA 1200G2 + 460W Generic and Dual PSU Link Cable
Risers: 8X Sata Ver006
M.2 Adapters: 2X M.2 PCIE 4X
OS: Ubuntu Server 16.04 64bit.
Drivers: 17.10
The build was in a Modem Pak 600mm rack that i picked up on trademe for $1 with a 10A PDU for power distribution including two shelf's.
GPU #0: Ellesmere, 4081 MB available, 36 compute units
GPU #1: Ellesmere, 4081 MB available, 36 compute units
GPU #2: Ellesmere, 4081 MB available, 36 compute units
GPU #3: Ellesmere, 4081 MB available, 36 compute units
GPU #4: Ellesmere, 4081 MB available, 36 compute units
GPU #5: Ellesmere, 4081 MB available, 36 compute units
GPU #6: Ellesmere, 4081 MB available, 36 compute units
GPU #7: Ellesmere, 4081 MB available, 36 compute units
ETH - Total Speed: 236.132 Mh/s, Total Shares: 3210, Rejected: 0, Time: 19:03
ETH: GPU0 29.222 Mh/s, GPU1 29.556 Mh/s, GPU2 29.571 Mh/s, GPU3 29.554 Mh/s, GPU4 29.553 Mh/s, GPU5 29.561 Mh/s, GPU6 29.567 Mh/s, GPU7 29.548 Mh/s
Incorrect ETH shares: none
All but one of the cards was able to run with 2075 Memory using the 1500 strap (hynix memory) and 1145 on the core @ 900mV
Images
Conclusion:
Their are a few people building 8 card rigs with Z270 chipsets but the H270 is cheaper so a much better choice for the cost benefit ratio.
I also have a pair of 1x PCIe to 3 PCIe 1x expansion boards so in theory i could get to 12 cards. My initial test with the PCIe expansion cards are they are not stable enough to utilize where up-time is key.
I would not recommend using these as they are note stable running GPU's
Future:
Instead i have order 2 of these, which are different in that they are a direct to Riser design which eliminates the extra connection when compared to the above design. This should in theory cause less signal degradation as only one hop is required to the riser instead of two. These should therefore be a much better option for expanding your mining rigs. These are also available in a 4 way package.
Utilizing 2 of these expansion boards 10 GPU's should be possible, I'll update the post when I have tested them out.