https://imgur.com/a/NHxbe

running at 355,7MH/s stable after blood sweat and tears which is what im hoping you won't have to go through

1 x ASUS B250 mining expert Motherboard
2 x 4Gb RAM
1 x Pentium 4400 CPU
8 x MSI VEGA 64 aircooled GPU's
2 x EVGA NOVASTAR 1600W PSU's
1 x 12v fan (very important will explain later)
8 x risers

Using 2 EVGA 1600 PSU's is an overkill but it was the easiest way to keep things uniform and have enough VGA outlets for cards and risers.
Used 5 GQ 6 to 8x2 cables from the EVGA 1000 pack and 6 G2 6 to 6+2 from the EVGA 1600 pack.
Be aware that the EVGA 1600 PSU (G2 cables) has a different manufacturer than the EVGA 1000 PSU (GQ flat cables) hence the operating frequencies and wiring of the sockets is different. You can use the GQ cables on the 1600 but you CANNOT use the G2 cables on the 1000.

We found that mixing these 2 power supplies (or any 2 or more different PSU's) on the same rig causes all sorts of problems, so its best when setting up multi GPU rigs to keep the PSU's uniform. In addition its problem avoiding to connect the riser power supply on the same PSU as the GPU.

Also be very aware that VEGAs are prone to Electro Magnetic inteference so try to keep the PSU's and any other EM generating devices (especialy spark gap devices) as far as possible from the rig. i found this out the hard way after almost throwing in the towel as i stupidly had an ozone maker ontop of the table and was wondering why each pc startup showed different PCIe's not working and system was freezing or dropping after a few mins of operation.

We also killed 2 Asrock H110 BTC Pro mobo's because of faulty riser adaptors as on 2 of them (from the same batch) had fused solder points making them into shortcircuit instant death for the mobo.
So please VISUALY INSPECT the risers especialy the solder points before instalation to avoid this happening to you.

 
(im a newbie here so my posts have to come with a 360 second gap)