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

CaseySJ

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I'm heading out with the family for the pool, but will test when I get back and let you know the results.
Because you're using 2666MHz DIMMs, we would be very interested in your results.
 

CaseySJ

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Hello @CaseySJ

have you tried those DDR4 memory combinations with iMac20,1 SMBIOS ? It would interesting to have a Mac model correlation :)
Unfortunately iMac20,1 did not help…
 
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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??
Hi @CaseySJ, I can run the setup with XMP off or on. When XMP is on and set at 2666 MHz, it runs at 2667 MHz.
At least with Mojave, XMP doesn't seem to make a difference. BIOS is the modifed F9i. FWIW, Sleep is disabled because this machine is for Pro Tools.
 

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CaseySJ

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Hi @CaseySJ, I can run the setup with XMP off or on. When XMP is on and set at 2666 MHz, it runs at 2667 MHz.
At least with Mojave, XMP doesn't seem to make a difference. BIOS is the modifed F9i.
So just to triple confirm:
  • AppleVTD appears in IOReg? --> Yes
  • And WiFi / Ethernet can connect? --> Yes
  • This is with four 16GB 2666MHz DIMMs on Z390 Designare? --> Yes
(OS is Mojave)

Update: Got the answers from this post. Looks like this is the memory you're using:

Screen Shot 2021-06-27 at 11.48.12 AM.png
 
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So just to triple confirm:
  • AppleVTD appears in IOReg?
  • And WiFi / Ethernet can connect?
  • This is with four 16GB 2666MHz DIMMs on Z390 Designare?
(OS is Mojave)
Yes. I've reattached the essential screen shots above. Should I include a BIOS Setup file and a serial-cleaned copy of my EFI? I'd really like to make my Z370 OC 060 Mojave setup work as much the same as possible, hence the ants in my pants to get help for that troublesome build that is nearly identical to the Z390 build.
 

CaseySJ

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Yes. I've reattached the essential screen shots above. Should I include a BIOS Setup file and a serial-cleaned copy of my EFI? I'd really like to make my Z370 OC 060 Mojave setup work as much the same as possible, hence the ants in my pants to get help for that troublesome build that is nearly identical to the Z390 build.
Have you already enabled VT-d on your Z370? If so, what side effects are you experiencing?

By the way, if you remove the DIMMs from memory slots A1 and B1 on the Z390 Designare, leaving only A2 and B2 populated with 16GB DIMMs, does WiFi and Ethernet still work?
 
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@CaseySJ @Elias64Fr

...here my experience with macOS Big Sur 11.4 (20F71)

ASUS X299

VT-d enabled in BIOS

Edit: The following two steps are not necessary. The system works flawlessly even with activated XMP profile and the higher clock rate of the memory.

XMP profile disabled in BIOS
Memory clock manually set to 2666 MHz

Four of eight memory banks used
4x Corsair - CMD32GX4M2B3000C15

WLAN OK
LAN 1 and 2 OK
Thunderbolt Ethernet OK
Bluetooth OK

AppleVTD present in IOReg
AVB works
 

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Last edited:

CaseySJ

Moderator
Joined
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Motherboard
Asus ProArt Z690-Creator
CPU
i7-12700K
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RX 6800 XT
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Classic Mac
  1. Quadra
Mobile Phone
  1. iOS
@CaseySJ @Elias64Fr

...here my experience with macOS Big Sur 11.4 (20F71)

ASUS X299

VT-d enabled in BIOS
XMP profile disabled in BIOS
Memory clock manually set to 2666 MHz
Four of eight memory banks used
4x Corsair - CMD32GX4M2B3000C15

WLAN OK
LAN 1 and 2 OK
Thunderbolt Ethernet OK
Bluetooth OK

AppleVTD present in IOReg
AVB works
Awesome! I've added your info to Experiment Update #3. Because you have an Intel HEDT (high-end desktop) platform, it should not be necessary to down-clock the memory.
 
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