R9 290X x2, R9 390 can't work together on a Asus Ranger VII

[pltrdy]

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

[1713553010]

1713553010

[antantti]

I feel your pain.

Try with only 8GB and another psu.

Latest bios?

[pltrdy]

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

[antantti]

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

Disable everything you don't need in bios. Gaming mobos normally have quite a lot to disable.

This sounds stupid but if there is a bios reset SWITCH, try it, remove battery.

-edit- and if that thing lets you boot to windows, download ddu, boot to safe mode and run that ddu. After that boot normally back to windows and install 15.12 drivers.

[pltrdy]

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...)