Quote from: 1nvader on November 12, 2017, 11:27:55 AM

Guys, I am struggling for two days now, maybe someone could help.

I have 6 x Sapphire RX 580 Nitro+ 8 GB and I am not able to use 6 of them. My bios is modded properly and they work fine if I use up to 4 cards in a rig. But once I get more than 4 cards - I have cards visibility problem.

I have tried numerous drivers options, blockchain drivers work the best, but they only get 4 cards max to work (for some reason, they work if the patch is no applied).

I have also tried configuring motherboard bios, disabled secure boot and switched PCI-E to Gen2.

Is there any possibility that my motherboard (Asus H170) is not able to take on more than 4 cards? One of the power connectors is not plugged in (Molex/M2).

Has someone else experienced this? Does this look like a purely driver issue?

I found that on the Asus H270 you need to enable "Above 4G Decoding" in the BIOS to get it to see more than 4 cards.
Video here of how it's done: https://www.youtube.com/watch?v=Z1FnEYI25z0

Found this post, on another forum, on how to do it for the Asus H170: https://forum.z.cash/t/issues-with-mobo-asus-h170-pro-gaming-cant-detect-6-gpus/8754/9

"'i've just signed up to let people know I've been successful in getting 6 GPUs to work with the Asus H170 Pro Gaming motherboard, here's how I got it to work (after much reading and trying different things):
Update to the latest BIOS
Enable new setting in BIOS "Above 4G Encoding"
Installing Windows via UEFI, not the standard MBR version (easily done with a little application called Rufus to create a UEFI bootable USB)"