Code 12 error when plugging 5 480s on Asrock B250 Pro4

[nikola_p]

Hello,

I am trying to build my first rig, but I ran into some problems I cannot explain.

When I tried to plug five SAPPHIRE NITRO+ RADEON RX 480 8G GPUs using USB risers with voltage control on ASRock B250 Pro4 motherboard the following error was observed in Device Manager:
https://drive.google.com/file/d/0ByzuACq8YfyyR3l4N2d6Nlp3STA/view?usp=sharing

In that case only 2 GPUs are recognised and work correctly. There are no problems when 4 GPUs are plugged. I tried to re-flash the BIOS and tweak some settings with no result. As far as I know the motherboard should be fully capable of running 5 GPUs. Please help me because I am using only 4 out of 5 GPUs and it drives me crazy.

I am using ADATA SSD drive and Celeron CPU if that matters. Also everything is running on Windows 10 (not activated).

Thank you in advance!

[reb0rn21]

Go into the bios try to find
TOLUD "Top Of Lower Usable Dram"
set it to 3.5G

its somewhere under PCI-e where the integretaed graphic is also set......

[dagarair]

what he said =)

[nikola_p]

That was so simple and it worked just like that. Thanks big time guys!

I played with chipset settings, but with zero result. Even started thinking I bought the wrong motherboard. Now everything works

Thanks again!

Do you know a good OC settings for these GPUs? I tried few but nothing stable.

[deadsix]

Go into the bios try to find
TOLUD "Top Of Lower Usable Dram"
set it to 3.5G

its somewhere under PCI-e where the integretaed graphic is also set......

This doesn't seem to work for me, I just stop getting any display. I think its because I have insufficient ram, can someone confirm if this works with 4GB ram?

[nikola_p]

Hello,
Do you have exactly the same configuration?

[deadsix]

Hello,
Do you have exactly the same configuration?

B250 pro 4, 4GB RAM and 5x RX 470 4GB, so I was wondering if you had 4GB of system ram or greater?

[deadsix]

Anyone? Can you please confirm that you increasing TOLUD works for you with 4GB of system ram?

[reb0rn21]

TOLUD works only if you boot to windows with code 12 error

if no screen then try to update bios or some extender is bad, try with 4 GPU then add 5th

[deadsix]

TOLUD works only if you boot to windows with code 12 error

if no screen then try to update bios or some extender is bad, try with 4 GPU then add 5th

Yes, and thats exactly the issue im facing, all 5 cards are detected but windows shows code 12 in 3 of them. But the solution, increasing tolud to 3.5 just stops all display, the card hdmi out gets no display, the motherboard hdmi out gets no display. I have to clear cmos and start over to get any display. So I was asking if anyone who has used the Tolud fix has ever used it sucessfully on 4GB ram?

[Grim]

Many motherboards (from the newest socket 1151) even lack the TOLUD bios setting.
(only relevant for the 100 and 200 family intel chipsets).

It would be nice for people with these chipsets to share if their mobo bioses even have/allow the TOLUD setting to be changed.


So far we know the following:


------------------------------------------

Has TOLUD setting in bios:

Asrock
MSI


Has NO TOLUD setting in bios:

Asus



------------------------------------------

Any mobo bios modders out there  

[andrewaka]

TOLUD works only if you boot to windows with code 12 error

if no screen then try to update bios or some extender is bad, try with 4 GPU then add 5th

Yes, and thats exactly the issue im facing, all 5 cards are detected but windows shows code 12 in 3 of them. But the solution, increasing tolud to 3.5 just stops all display, the card hdmi out gets no display, the motherboard hdmi out gets no display. I have to clear cmos and start over to get any display. So I was asking if anyone who has used the Tolud fix has ever used it sucessfully on 4GB ram?

the same problem with msi z170a krait gaming x3. have 4gb ram...

[Grim]

Would be great if you can try it with 8 and 16 GB ram.

[Grim]

Gigabyte seems to have out of the box a lower TOLUD setting. But doesn't seem to have an option in bios.

[Millenium Falcon]

I had the same problem. I have changed cheap gray risers to USB3.0 Risers with additional power and it works now.

[andrewaka]

Would be great if you can try it with 8 and 16 GB ram.

8 gb didnt solve the problem.

[amfofo]

i have the same problem with my msi a88x-g45 gaming
cant find the TOLUD settings in Bios

[AltScope]

i have the same problem with my msi a88x-g45 gaming
cant find the TOLUD settings in Bios

sorry for the bump but same issue

Msi z270-a pro mobo
8gb ddr4
pentium g4620
4* 8gb rx480
1* 8gb rx580
win 7 x64

no tolud setting in bios, there is a 4g cryptocurrency setting that describes itself as allowing you to run several gpu's however with this on the system there is no video out

virtual memory set to 16gb, mines fine with 4 cards but adding the 5th gives error 21

any help would be appreciated

[Undefined31415]

i have the same problem with my msi a88x-g45 gaming
cant find the TOLUD settings in Bios

sorry for the bump but same issue

Msi z270-a pro mobo
8gb ddr4
pentium g4620
4* 8gb rx480
1* 8gb rx580
win 7 x64

no tolud setting in bios, there is a 4g cryptocurrency setting that describes itself as allowing you to run several gpu's however with this on the system there is no video out

virtual memory set to 16gb, mines fine with 4 cards but adding the 5th gives error 21

any help would be appreciated

Windows 7 can be very difficult when it comes to going over 4 GPUs. Some people have had success with 5-6, but it's often hit and miss, especially when the drivers for these more recent cards don't support the old 6x GPU mod for Windows.

If you're not a Linux user, I would recommend using Windows 10, or at least Windows 8.1.

[AltScope]

...


Windows 7 can be very difficult when it comes to going over 4 GPUs. Some people have had success with 5-6, but it's often hit and miss, especially when the drivers for these more recent cards don't support the old 6x GPU mod for Windows.

If you're not a Linux user, I would recommend using Windows 10, or at least Windows 8.1.

cheers I'll try on windows 10 later

[bluedeep]

i have the same problem with my msi a88x-g45 gaming
cant find the TOLUD settings in Bios

sorry for the bump but same issue

Msi z270-a pro mobo
8gb ddr4
pentium g4620
4* 8gb rx480
1* 8gb rx580
win 7 x64

no tolud setting in bios, there is a 4g cryptocurrency setting that describes itself as allowing you to run several gpu's however with this on the system there is no video out

virtual memory set to 16gb, mines fine with 4 cards but adding the 5th gives error 21

any help would be appreciated

Windows 7 can be very difficult when it comes to going over 4 GPUs. Some people have had success with 5-6, but it's often hit and miss, especially when the drivers for these more recent cards don't support the old 6x GPU mod for Windows.

If you're not a Linux user, I would recommend using Windows 10, or at least Windows 8.1.

On Win 7  you can use six GPU with no problem ( with 6gpu_mod) On Win 10  you can use 8 GPU ( in my case).

[AltScope]

i have the same problem with my msi a88x-g45 gaming
cant find the TOLUD settings in Bios

sorry for the bump but same issue

Msi z270-a pro mobo
8gb ddr4
pentium g4620
4* 8gb rx480
1* 8gb rx580
win 7 x64

no tolud setting in bios, there is a 4g cryptocurrency setting that describes itself as allowing you to run several gpu's however with this on the system there is no video out

virtual memory set to 16gb, mines fine with 4 cards but adding the 5th gives error 21

any help would be appreciated

Windows 7 can be very difficult when it comes to going over 4 GPUs. Some people have had success with 5-6, but it's often hit and miss, especially when the drivers for these more recent cards don't support the old 6x GPU mod for Windows.

If you're not a Linux user, I would recommend using Windows 10, or at least Windows 8.1.

On Win 7  you can use six GPU with no problem ( with 6gpu_mod) On Win 10  you can use 8 GPU ( in my case).

windows 10 had the same issue, the solution did involve 10 though 7 modded would've worked

disabled 4 g mod system boots with 5 cards
install and patch drivers
reboot and enable 4gmod
system boots fine

so it appears for some reason windows wont enable the gpu at all if the drivers aren't patched while 4g mod is on resulting in a black screen

[BiteByte]

Thanks All,
After fluffing with PCIe settings in bios for the last 24 hours with an ASUS mobo, reading this put me in the correct area.
I could only run 4 GPU's. The 5th would cause all but one to have in their Device properties saying... The device cannot find enough resources that it can use:  code 12
Enabling advanced system agent configuration > Above 4G coding fixed it instantly.
A big yahoo when it worked!!!!
Cheers!!!!

[CryptoWatcher420]

Many motherboards (from the newest socket 1151) even lack the TOLUD bios setting.
(only relevant for the 100 and 200 family intel chipsets).

It would be nice for people with these chipsets to share if their mobo bioses even have/allow the TOLUD setting to be changed.


So far we know the following:


------------------------------------------

Has TOLUD setting in bios:

Asrock
MSI


Has NO TOLUD setting in bios:

Asus



------------------------------------------

Any mobo bios modders out there  

actually the asrock info is incorrect, lots of there mobo's DO NOT have that setting, take the asrock h81 pro btc motherboards for instance or how about the asrock z97 extreme4 both of those do not have those settings to mess with, just thought I should correct you on that before too many people get the WRONG information