Good evening everybody,
 
I am currently in the process of adding more GPUs to my mining rigs and have run into a little difficulty. When I plug in (using powered usb risers) more than 4 GPUs the system freaks out and gives me 3 beeps pause 3 beeps. When I plug in 4 GPUs the BIOS recognizes them, even though Precision only sees 3. Does anyone have any idea how to fix this?
 
System Specs
 
Z170 Classified 4-Way
32 GB Ram
256 SSD
2TB HDD
6x GTX 1070s
EVGA 1300W G2
Thanks all

Whoops you are correct my apologies. It's an i7-6700k and yeah what is weird is that the board has 6 PCI-E 1x slots, which is where the risers come into play. I am using 16x to 1x risers in order to fit 6 GPUs and fill all of the PCI-E lanes.

bcavnaugh

boomersooner550
Whoops you are correct my apologies. It's an i7-6700k and yeah what is weird is that the board has 6 PCI-E 1x slots, which is where the risers come into play. I am using 16x to 1x risers in order to fit 6 GPUs and fill all of the PCI-E lanes.

The i7-6700k CPU has 16 PCIe Lanes + 4 Lanes from PCH + 8 lanes from PLX Total 28
Are you using a M.2 Device?
Did you Plug in the 6-pin PCIE Power Connector on the Lower Left side of the Motherboard?  See Note Below.
 

PCI-E Lane Distribution

PE1 – x16 (x8 if PE2 is used), 16/8 lanes from CPU

PE2 – x16 (x8 if PE3 is used), 16/8 lanes from PLX

PE3 – x8, 8 lanes from PLX

PE4 – x16 (x8 if PE6 is used), 16/8 lanes from PLX

PE5 – x4, 4 lanes from PCH

PE6 – x8, 8 lanes from PLX
 
PE5 would be in question
 

5x PCI-E 3.0 3x16/8, 2x8 slots

1x PCI-E 3.0 1x4 (4 Lanes from PCH) slot

2x M.2

-1x Key M speeds up to 32Gbps (PCIE 3.0 x4 or SATA 3.0), shared with 2x native SATA

-1x Key E (PCIE)
 
 
NOTE:

The 6pin PCIE connector present on the motherboard is there to provide

additional power to the PCIE slots rather than pulling it all from the 24 pin

main power. It is advised when using SLI especially with higher power draw

cards, 3 and 4 way SLI it is strongly recommended to use this, regardless of

GPU.
 
From

Yes I have both supplemental power plugs in, no M.2 storage. All cards would be plugged in through a riser so that they are only 1x.

bcavnaugh

boomersooner550
Yes I have both supplemental power plugs in, no M.2 storage. All cards would be plugged in through a riser so that they are only 1x.

Their is only ONE 6-Pin Power Connector on the MB, the one at the Bottom Left of the MB.
Their are Two 8-Pin at the TOP of the MB for the CPU.
 
The one you NEED to connect is at the Bottom Right in the Below Image in the Yellow Circle.
It is a standard 6-Pin Graphics Card Power Cable.
 

Ahh no I did not have that plugged in... Testing now.

bcavnaugh

boomersooner550
Yes I have both supplemental power plugs in, no M.2 storage. All cards would be plugged in through a riser so that they are only 1x.

Their is only ONE 6-Pin Power Connector on the MB, the one at the Bottom Left of the MB.
Their are Two 8-Pin at the TOP of the MB for the CPU.
 
The one you NEED to connect is at the Bottom Right in the Below Image in the Yellow Circle.
It is a standard 6-Pin Graphics Card Power Cable.
 

I handle 4 GPUs just fine but once I get to 5 it doesn't boot, throws code 62 (which I believe is South Bridge), and gives me 3 short beeps pause 3 short beeps.

bcavnaugh
Do not use PCIe#5 skip it and use PCIe#6 and test only 5 Cards
KEEP the 6-Pin Connector Plug In!
 

PE1 – x16 (x8 if PE2 is used), 16/8 lanes from CPU

PE2 – x16 (x8 if PE3 is used), 16/8 lanes from PLX

PE3 – x8, 8 lanes from PLX

PE4 – x16 (x8 if PE6 is used), 16/8 lanes from PLX

PE5 – x4, 4 lanes from PCH (DO NOT USE THIS SLOT)

PE6 – x8, 8 lanes from PLX

Well it does boot now but in BIOS it only is seeing 4 GPUs

bcavnaugh

boomersooner550

bcavnaugh
Do not use PCIe#5 skip it and use PCIe#6 and test only 5 Cards
KEEP the 6-Pin Connector Plug In!
 

PE1 – x16 (x8 if PE2 is used), 16/8 lanes from CPU

PE2 – x16 (x8 if PE3 is used), 16/8 lanes from PLX

PE3 – x8, 8 lanes from PLX

PE4 – x16 (x8 if PE6 is used), 16/8 lanes from PLX

PE5 – x4, 4 lanes from PCH (DO NOT USE THIS SLOT)

PE6 – x8, 8 lanes from PLX

Well it does boot now but in BIOS it only is seeing 4 GPUs

OK what is the OS Showing?
Also in the Bios did you set the PCIe Lanes to Auto or x8, do not set them to x16

OS was only showing 4 and the PCIe lanes were set to auto