ASRock H81 Pro will not accept more than 2 GPU's (Code 12)

[melpheos]

After days of debug i found the solution with this motherboard.
Drop Windows 10 with this board and install Windows 7. All your GPU will be recognised in no time.

Forget about windows 10. Not to mention i have better performance with windows 7.

A noticable hash rate difference in all your GPUs? What percentage increase did you see with w7?

Maybe the issue was with my system but with 6GPU i was running neoscrypt at around 7200 on windows 10 and 7800 on windows 7

Thanks. I'm getting about 8000 on win10 with 6x1070ti, but had to disable some CPU-intensive stuff to get there.

What is your power level ?

[dingodan]

100% - power is cheap over here. You at 65%?

[melpheos]

100% - power is cheap over here. You at 65%?

Yes... Wish i had cheap power (0.15 here) but my real limit is ventilation.
My cellar is getting too hot when i put more than 75%. I already have a massive 1000CFM fan for extraction but i'm waiting for a fan controller. It's too damn loud at max speed

[WickedPigeon]

I'm really, really learning to hate this board.

I have one H81 of the 5 rigs I have. all have 5 or 6 GPU's per Rig. AND this one, the H81, has given me nothing but problems. The miner crashes on this board, it freezes, and for what ever reason, this board hates me. Maybe it's Windows, maybe it's me, maybe it's the board.

I started with this rig 6 months ago, and rebuilt it so,so many times. First Win 10, but back then - Win 10 had issues, switched to Win 7. That worked for a while but recently I was having problems with ccminer freezing - so... I thought maybe it's time to go back to Win 10.

UGH... now I cant get it to boot when I add the third GPU. Every time I add the third GPU it gets stuck in Windows startup.

Any thoughts?

[WickedPigeon]

Finally fix it.

I followed what Asrock tech support said to do in a review on Newegg:

Dear Valued ASRock Customer,

We sincerely apologize for any inconvenience this may have caused you.
Please try following to trouble shoot the board.
Unplug the power, clear the CMOS.
Load the BIOS setting default.
Test with 1 x GPU and known good raiser card on each PCIE slot one at the time to verify all slots are working individually.
Same to raiser cards and GPU to test individually.
Populate the cards if all slots, raiser cards and GPUs are working individually.
Check the PSU is enough power for whole unit.
If you have any technical support inquiry, please contact us at http://www.ASRock.com/Support/tsd.asp
We will assist you shortly.

Thank you

ASRock Support
Tech Support Email: http://www.ASRock.com/Support/tsd.asp

After each raiser was connected, I had to allow for 3-5 minutes for Windows to get through the log on screen, but after that it worked. That was a horrible couple of days.

[phrostb]

anyone having issues with this board on linux (simplemining). i bought a lot of these boards (only wanted 1 for testing but it wasn't my choice) and it seems like it'll work just fine (using bios 1.30b) at first but as i start adding gpus eventually the network adapter will stop responding and i get this error:
a start job is running for raise network interfaces.. and it never finds it. can't see the rigs on my local network either. i'm really not sure what could be causing this :/