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[SUCCESS] Gigabyte Designare Z390 (Thunderbolt 3) + i7-9700K + AMD RX 580

Correct me if I am wrong but I think all the successful builds have been using OpenCore and not Clover....
Correct. Clover does not work — at least I haven’t found a way. By now we should all be switching to OpenCore.
 
Yep! This is one reason I'm trying to get this going on my #2 build (Z370) as well; to see if this can be propagated down, so to speak. FWIW, I bought Corsair LPX 2666MHz RAM so that I could run the "native" im/iMp RAM speed without having to count on XMP. Note that this is Mojave.
Wow! So a Z390 Designare with 64GB of native 2666MHz memory has no side effects with AppleVTD!
  • Is XMP Profile 1 disabled?
  • Which version of BIOS is installed?
Will add your name and to “Experiment Update #3”.

Does anyone else have native 2666MHz memory??
 
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From OpenCore manual, disableiomapper section :
Note 2: Misconfigured IOMMU in the firmware may result in broken devices such as Ethernet or Wi-Fi adapters. For instance, an Ethernet adapter may cycle in link-up link-down state infinitely and a Wi-Fi adapter may fail to discover networks. Gigabyte is one of the most common OEMs with these issues.
 
Not sure if this VT-d business is only for those with modified TB firmware, but tried anyway. No wifi/ethernet for me with:

  • DisableIOMapper off and dart=0 removed.
  • VT-d enabled in bios.
  • 4x16GB ram @2666 MHz (can't do 3000 because usb disks get ejected during sleep).
For fun I tried without XMP too but same result.
Just to be clear, is your memory natively spec’d at 3000MHz, but you’ve disabled XMP and down-clocked it to 2666MHz?
 
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Yes because I tried down-clocking without success.
Could you please check if you ram is in this Z390 Designare RAM compatibility official list

"2 DIMM: Supports one pair of modules inserted into the same color slots as one pair of Dual-channel memory configuration. Install the modules into DDR4_A2, DDR4_B2 for better compatibility."
 
Could you please check if you ram is in this Z390 Designare RAM compatibility official list

"2 DIMM: Supports one pair of modules inserted into the same color slots as one pair of Dual-channel memory configuration. Install the modules into DDR4_A2, DDR4_B2 for better compatibility."
I have one of models in the inner red box. Will get the exact part number. My primary Z390 Designare has four 8GB modules (all G.Skill).

C9D53205-8FB8-44B2-A64D-B00ED56D0011.jpeg
 
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Might the troubles you all are facing have anything to do with the BIOS version?

I haven’t tried any custom BIOSes, but I can confirm that I use VT-d with 4 8GB DIMMs with XMP on Z490 Vision D, and I don’t have any problems with the f5 BIOS.

But I had major problems with f20 and XMP on. USB disks were regularly being ejected during sleep. I downclocked the memory from 3200 to 2666, and that tended to help, but it wasn’t 100 percent foolproof.

I wonder if there’s a particular BIOS version you all should use?
 
Might the troubles you all are facing have anything to do with the BIOS version?

I haven’t tried any custom BIOSes, but I can confirm that I use VT-d with 4 8GB DIMMs with XMP on Z490 Vision D, and I don’t have any problems with the f5 BIOS.

But I had major problems with f20 and XMP on. USB disks were regularly being ejected during sleep. I downclocked the memory from 3200 to 2666, and that tended to help, but it wasn’t 100 percent foolproof.

I wonder if there’s a particular BIOS version you all should use?
Interesting. What is the make/model of your 8GB DIMM, and its native speed?

I tried various combinations of 16GB DIMMs on my Z490 Vision D that is also running stock F5, but side effects disappear when only one 16GB module is installed. Haven’t tried 8GB modules exclusively on that system yet.
 
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