VEGA 64 - 5 of 6 card are available, what's the problem?

[infeneon]

Hello everyone,

 I have a rig with the follow configuration:

MB: Asus Z270-P
CPU: Celeron G3930
RAM: 8Gb + SWAP 70Gb
POWER: 2x1200 Corsair HX
GPU: 6xVEGA64 Sapphire
OS: Windows 10

 When I start the rig only 5 card enable red led near additional power cables.

I have changed everything - MB, raisers, power, reinstall OS, change bios settings... etc

 All GPU work fine when I install them alone.

What is the problem?

Last time I completely rebuild everything and reinstall Windows on new SSD with one card and 4G off option. Than install blockchain drivers, enable 4G in BIOS and add other cards. Nothing changed.

Thanks

[burned4]

I had the same issue with a Gigabyte motherboard and the problem was solved by flashing a new version of the bios.

[infeneon]

I have latest version of bios.

 8x1070ti works fine on this MB

[infeneon]

Now I have only one way - buy 2 more cards and build two rigs with 4 cards per each one. But this is not I whanted 

 Does anybody solve the problem and have working rig with 6xVega 64 and 1900 moner on each?