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ASRock X370 Pro - Can't POST with 8 GPUs

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JohnM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JohnM Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2018 at 9:29pm
Good luck, you have a few things to try so one of them might work! Let us know how you get on.
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MisterJ View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote MisterJ Quote  Post ReplyReply Direct Link To This Post Posted: 02 Mar 2018 at 2:39am
ASRickroll, please try again to open an AMD Support Ticket.  I only reported your ticket problem.  Enjoy, John.

EDIT: AMD response to my Ticket was to try a different browser.


Edited by MisterJ - 03 Mar 2018 at 12:28am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ASRickroll Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2018 at 10:24am
Originally posted by MisterJ MisterJ wrote:

ASRickroll, please try again to open an AMD Support Ticket.  I only reported your ticket problem.  Enjoy, John.

EDIT: AMD response to my Ticket was to try a different browser.

I used different browser (was Chrome, now Firefox) and still getting the same error submitting ticket.
I tried again without attaching any files and it was submitted, fingers crossed.

By the way I tried inserting the last GPU into PCIe slot directly and also tried using the M.2 socket (was using M.2 -> PCIe adapter) without any luck.

I'm now convinced that the problem is not because I hit PCIe lanes limit. Someone in another forum mentioned that it might be because the motherboard does not have enough power to support that many PCIe devices (even though all my PCIe risers are self-powered directly from PSU).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MisterJ Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2018 at 10:51am
ASRickroll, did you try attaching a Word Doc, PDF or JPG?  Thanks for informing us.  Please let us know what they have to say.  Thanks and enjoy, John.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote benb Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2018 at 1:03pm
Did you get a custom bios that enables "Above 4G Decoding" from Asrock? 

They can build it for you, wish they would just let it in all their bios. 
They gave me a custom bios a while ago that enabled the flag, but it is 2.12 ish . I am going to ask them for an updated bios because the newer agesa is suppose to address some of the linux/ryzen issues for early series chips. 

 
"Above 4G Decoding" works as  long as CSM is disabled or if enabled only with UEFI OpRoms(There are three, PXE,Storage and Something else) 


You might want to disable CSM first , ie remove some cards boot , disable CSM and only allow UEFI to load. 


Hopefully if we bother Asrock enough they will just roll the "Above 4G Decoding" out to their bios with a comment  "For mining/advance users", something along those lines. 

Biostar and MSI have rolled out the option to their bioses and I think gigabyte also. Only ASUS and Asrock for some reason aren't rolling it out. 

Example MSI rolled "Above 4G Decoding" out to all their x370 motherboards. http://www.nag.co.za/2017/07/14/msi-revamps-their-bios-to-support-crypto-mining-farms-better/



Edited by benb - 09 Mar 2018 at 1:13pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pbfarmer Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2018 at 6:48pm
Originally posted by benb benb wrote:

Did you get a custom bios that enables "Above 4G Decoding" from Asrock? 

They can build it for you, wish they would just let it in all their bios. 
They gave me a custom bios a while ago that enabled the flag, but it is 2.12 ish . I am going to ask them for an updated bios because the newer agesa is suppose to address some of the linux/ryzen issues for early series chips. 

 
"Above 4G Decoding" works as  long as CSM is disabled or if enabled only with UEFI OpRoms(There are three, PXE,Storage and Something else) 


You might want to disable CSM first , ie remove some cards boot , disable CSM and only allow UEFI to load. 


Hopefully if we bother Asrock enough they will just roll the "Above 4G Decoding" out to their bios with a comment  "For mining/advance users", something along those lines. 

Biostar and MSI have rolled out the option to their bioses and I think gigabyte also. Only ASUS and Asrock for some reason aren't rolling it out. 

Example MSI rolled "Above 4G Decoding" out to all their x370 motherboards. http://www.nag.co.za/2017/07/14/msi-revamps-their-bios-to-support-crypto-mining-farms-better/


Was wondering why this option wasn't available - was thinking it just wasn't applicable for AMD for some reason, until I just tried installing my 8th card.  Same issue as OP - can use 7 GPUs in any config (including 5 PCIE + 2 M.2 - all risered,) but adding the 8th won't post - get 0d error.  Hardware isn't faulty, plenty of PCIE lanes, power shouldn't be an issue, so now I'm assuming the 4G decoding issue is the problem.

I've tried disabling CSM but it doesn't change anything.  I unfortunately installed Win10 using an MBR/FAT32 image, so I seem to be running in legacy mode regardless of that setting (it gets ignored or auto-reset?)  I suppose I can reinstall Windows and try disabling CSM again, before reaching out to ASRock for a custom rom.

Are you running 8+ GPUs w/ the custom uefi?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MisterJ Quote  Post ReplyReply Direct Link To This Post Posted: 10 Mar 2018 at 12:37am
pbfarmer, you can use diskpart to convert your disk to GPT.  All data will be lost, so do it during W10 install.  Hit Shift-F10 to open an Administrator Command Prompt.  Type diskpart.  Do a List disk and find your disk.  Do a select disk #, where # is the number just found.  Then do a convert GPT.  Diskpart is very unforgiving.  It says nothing and ask nothing, just does what told.  Make double sure you have  selected the correct disk.  Please post for all of us what "Above 4G Decoding" means.  Thanks and enjoy, John.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote TooQik Quote  Post ReplyReply Direct Link To This Post Posted: 10 Mar 2018 at 12:07pm
Originally posted by MisterJ MisterJ wrote:

pbfarmer, you can use diskpart to convert your disk to GPT.  All data will be lost, so do it during W10 install.  Hit Shift-F10 to open an Administrator Command Prompt.  Type diskpart.  Do a List disk and find your disk.  Do a select disk #, where # is the number just found.  Then do a convert GPT.  Diskpart is very unforgiving.  It says nothing and ask nothing, just does what told.  Make double sure you have  selected the correct disk.  Please post for all of us what "Above 4G Decoding" means.  Thanks and enjoy, John.


Here's a couple of articles that explain the boot process and the hardware address mapping that occurs for the PCI and PCIe buses:

http://resources.infosecinstitute.com/system-address-map-initialization-in-x86x64-architecture-part-1-pci-based-systems/#gref

http://resources.infosecinstitute.com/system-address-map-initialization-x86x64-architecture-part-2-pci-express-based-systems/#gref

My understanding may not be 100%, but what I gather from reading the two articles is the current motherboard BIOS doesn't allow the system address mapping to exceed 4GB, which is a legacy amount to support 32 bit systems. When the eighth GPU is being added it's unable to map the PCIe device to the system memory map as it exceeds the 4GB of system memory.

Motherboard manufacturers need to include code to allow this limitation to be overcome ie. Above 4G decoding.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MisterJ Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2018 at 12:35am
Thanks, TooQik.  It looked like a great article, but the site is really bad.  It kept displaying stuff I did not want and then gave a full screen display about "phishing".  I closed the site and will avoid it, but learned a lot before I surrendered.  Booting and allocating RAM is very complicated and I see why a switch to get rid of the 4GB limit is required.  I hope all of you needing it are pestering ASRock to implement it permanently.  I also wonder if AMD could put the switch in their area so all boards get it.  Perhaps some need to petition AMD for the function.  Thanks and enjoy, John.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JohnM Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 2018 at 1:02am
Originally posted by MisterJ MisterJ wrote:

pbfarmer, you can use diskpart to convert your disk to GPT.  All data will be lost, so do it during W10 install.

You can do it in situ with Windows 10 using mbr2gpt.exe. I made the same mistake myself and this worked perfectly.


Don't worry about the title of the URL - it isn't about Optane at all. It's just that you need UEFI boot in order to use Optane.
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