Fail to start Windows/SimpleMiningOS with 4 RX 480's plugged in (but 3 work)

[Spookymango]

I have:
- 1x ASUS H270-Plus mobo with 6 PCIE slots (2*16x, 4*1x)
- 6x XFX RX 480 GPUs
- 6x Ver007 Powered USB Risers
- 1x EVGA 1300 PSU
- 8GB of Ram and an Intel Pentium CPU

I'm powering the USB Risers

I can boot Windows and SimpleMiningOS with 3GPUs plugged in, but not 4. If I plug in a 4th GPU, SimpleMiningOS boots, but the screen stays black, and hitting any key reboots the machine. Windows won't boot at all.

I power each USB Riser using molex connectors hooked up to the PSU.

I've tried setting each PCI-E slot to Gen1 (and every other option: Auto and Gen 2/3), tried set the PCI PEG setting to disabled (and every other option), and tried enabling/disabling 4G decoding. In fact, I've tried setting every combination of the above, but to no avail.

I can boot into SimpleMiningOS with 3 cards plugged in to the 1x PCIE slots over powered usb risers, but can not boot with a 4th card. I tried plugging the 4th into both the final PCI-E 1x slot and either of the free PCIE 16x slots, it makes no difference.

All cards are stock. I haven't flashed them with any custom BIOS, and haven't tried over/under clocking them yet.

I know it's not a bad card/riser that's causing the issue, because I tried rotating cards/risers, and each of them work just fine as long as only 3 GPUs are installed when I boot up.

What else can I try to get 4 GPUs booting? Obviously I'd like to get all 6 working, but... baby steps.

[crypticj]

There is a custom version of simplemining you should try that.

go to main page https://simplemining.net/

Download Underneath RX look for Z170 version and dd version

Here is a direct Link: https://simplemining.net/download/simpleminer-RX-v1093-4.11.rc8-16.60-enableexe0ANDips0.imgc

use that one it worked for me.

[EncinoMan]

Hey Spookymango, did you find a solution?

I am having very similar problems with 6 x RX480's and a H270 chipset.

[joLE]

I can boot Windows and SimpleMiningOS with 3GPUs plugged in, but not 4. If I plug in a 4th GPU, SimpleMiningOS boots, but the screen stays black, and hitting any key reboots the machine. Windows won't boot at all.

Same problem here, did anybody found solution?

[joLE]

I can boot Windows and SimpleMiningOS with 3GPUs plugged in, but not 4. If I plug in a 4th GPU, SimpleMiningOS boots, but the screen stays black, and hitting any key reboots the machine. Windows won't boot at all.

Same problem here, did anybody found solution?

connect hdmi from igpu to pcie gpu