Thx again.

I'll try disabling.
Concerning bios i checked last version (it was), reset settings.
I guess, by bios reset switch you mean CMOS Clear, right?


About ddu, thx i havent header about it, could be good as i installed several drivers, can be messy atm.
Any reason behind the driver version (15.12)?



Thanks
(note: i got two asus rog cards, both 1150, respectively maximus vii ranger & maximus vii hero. I will have next week a B75 Anniversary from ASRoock, with 1x PCI-E x16 & 5x PCI-E x1, could try on it
I am currently running without any troubles
- R9 290x + Sapphire 7950
- R9 390 + Sapphire 7950
Just to keep mining a bit even if my second r9 290x is sleeping...)

Ty for reply. Yes lastest bios.

There is probably something wrong is my bios conf.

I'm trying to plug those 2x 290x on a Asus Rog Maximus VII Hero (on PCI-E 3.0 x16) with a 1600W brand new PSU.

Not working as well Oo
Windows crashes on startup (during flag u know) and same 'b2' code on motherboard.

Can't find anything relevant about 'b2'

Regards

Hey guys,

here's my setup:
- MB: Asus Rog Ranger VII
- CPU: i5 4xxx (who cares)
- RAM: 2x 8G
- PSU: Corsair AX 1200W
- GPU: 1x Asus R9 390 DCUII (call it A); 1x R9 290X Tri-X (Sapphire) (call it S); 1x R9 290X Windforce (Gigabyte) (call it G) & some sapphire 7950
- OS: Windows 10, x64
- AMD Driver: last one (this august)

I just don't manage to get 2 of them work at the same time.
What I tried:
- Asus only: OK
- Sapphire only: OK
Gigabyte only: OK
So it looks like drivers etc are ok. I also used both PCI-Ex3 port, work on both, so not port issue.

Now none of each combinaison of two cards (A+S; A+G; S+G) works.
The problem is either: not booting (motherboard led code: b4), or freezing quite directly, or one card can't be use (you know when the driver fails, in Windows periphericals it show with a warning flag).
In the BIOS usually only one of the two is recognized, sometime 0...

Even more strange (can it be?), i tried 1x <one of A,S,G> + 1x 7950, and here it works.

It really looks like the PSU is not enough (as small card can run) but COMMON its a 1,2kW PSU, it must actually be oversized for 2 cards.

Any idea, feedbacks?
Thanks tho...it looks like it harder to mine using expensive motherboards...

pltrdy