maximum PCI resources supermicro X9DRG-QF

chune

Member
Oct 28, 2013
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My X9DRG-QF will boot fine with 4x Radeon Pro Duo (dual GPU card with 16gb PER GPU) but as soon as i add the 5th it wont post. I am not using any hypervisor, just booting straight to lubuntu. Above 4g decoding is enabled and i have tried all of the different MMIO base settings. Is this a limitation of the specific board or just BIOS in general? I know most people aren't trying to boot with 128gb+ of VRAM but I was hoping to get this to work with all five cards. Let me know if you have any suggestions
 

i386

Well-Known Member
Mar 18, 2016
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The system doesn't "see" vram.

How many video outputs does each card have? I think that there was some limit how many outputs are supported by bios/uefi.
 

chune

Member
Oct 28, 2013
107
22
18

Four outputs per card so a total of 20. Funny thing is that it posts fine with 5x rx570 8gb and each one of those has 5 outputs per card for a total of 25