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

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On my Asus X99 Deluxe II, VT-D is located here:
  • Advanced → System Agent Configuration → Intel VT for Directed I/O (VT-d)

:banghead: gah, was thinking of VT-X.. I already had VT-D enabled lol
 
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** Experiment Update #3 **
AppleVTD Side-Effects and Mitigation Strategies
It hasn't worked for me. Do I need to change the SSDT? I haven't used a lite/skinny one.

Asus X299 Prime Deluxe II
i9-7900X
4x16GB 3000Mhz DIMM
OSX 10.13.6
TB3 Titan Ridge (built-in) original FW 36
ANTELOPE DISCRETE 8

VT-d -> Enabled
DisableIOMapper (never was on)
Removed 'dart=0'
 

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Last edited:
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That's very interesting! You have four 16GB DIMMs running at 2666MHz. Can you confirm if WiFi and Ethernet ports actually connect. In other words, do you see the green dot next to them in System Preferences --> Network, as shown below?

@Inqnuam, do you also see green dots for built-in Ethernet ports and Fenvi WiFi (not Thunderbolt Ethernet)?
View attachment 522961
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.
 

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It hasn't worked for me. Do I need to change the SSDT? I haven't used a lite/skinny one.

Asus X299 Prime Deluxe II
i9-7900X
4x16GB 3000Mhz DIMM
OSX 10.13.6
TB3 Titan Ridge (built-in) original FW 36
ANTELOPE DISCRETE 8

VT-d -> Enabled
DisableIOMapper (never was on)
Removed 'dart=0'
Correct me if I am wrong but I think all the successful builds have been using OpenCore and not Clover....
 
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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.
 

CaseySJ

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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.
If you see “Experiment Update #3” you’ll find that so far only (a) 8GB x 2, (b) 8GB x 2 and 4GB x 1, and (c) possibly 16GB x 1 have no side effects.
 

CaseySJ

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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.
 

CaseySJ

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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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