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X299 Big Sur Support

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I just bought a 6800XT for 650€ on AMD site for "Drop Thursday" !!! They sell on eBay 1100/1200! Lucky me!!

So when it'll arrive I just have to swap cards since I already don't use weg, right?

Anyone interested in a 5700XT here? little discount for my hackintosh mates!

Nice congrats, very lucky.

Since you don't use WEG, it will just be a simple replace for you.
 
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I just bought a 6800XT for 650€ on AMD site for "Drop Thursday" !!! They sell on eBay 1100/1200! Lucky me!!

So when it'll arrive I just have to swap cards since I already don't use weg, right?

Anyone interested in a 5700XT here? little discount for my hackintosh mates!

Nice congrats, very lucky.

Since you don't use WEG, it will just be a simple replace for you.

Yeah should be simple replace. I would disable any SSDT/Device properties you had for your 5700XT first though. I believe there are 4 devices attached to the 6800XT (two are USB C) and the addresses may be different.
 
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Well... a monkey just teleported in my head guys! So... Anyone had experience with Cascade Lake-W Platform? It's actually the same as the real Mac Pro 2019 (same chipset C621 and same Xeon W-32XX CPUs)

What kind of benefits one would have with it compared to the Skylake HEDT? ok ECC RAM for max stability and more PCIe 3.0 lanes, anything else?

I'm planning to switch to Asus Pro WS C621 Sage - W-3235/W3245 - ECC RAM - 6800XT

Given the actual price I would sell my actual X299 board + 9980XE + NonECC RAM + 5700XT for a pretty penny

Any thoughts on this madness would be greatly appreciated! @ramazarusx I've seen you're actually tryin something similar, updates?

This would deserve its own thread in the appropriate section, but the thread on W-3175X is not quit suitable either, so I'll reply here.

Beside PCI lanes, the benefit of "true" Xeons (not E3/E-2xxx/W-1xxx, which are regular Core CPU with ECC support) is registered DIMM, which give access to larger capacities and cost less than UDIMM—a lot less when buying refurbished or second-hand hardware from server upgrades.
ECC never hurts, but I suspect that stability benefits mainly come from server-grade engineering of the boards and a lot of tedious, invisible, optimisations of the platform.

As you appear to not seek extreme core counts, Xeon W-2xxx on C422 would be the natural candidate for CascadeLake-W. There is a long thread on another forum on C422 boards (mostly Asus boards, but also Supermicro X11SRA-F), including working Clover and OpenCore EFI folders. There are refurbished W-21xx Xeons (Skylake) on eBay for low prices, even including the custom Xeons for the iMacPro.
I found a fair price on a CascadeLake W-2255 and bought a Fujitsu/Kontron D3598-B industrial motherboard, whose layout fits well with a modified MacPro case I had. Yesterday I dumped the ACPI tables, wrote custom SSDT for OpenCore and… watched Mojave installing without any intervention between the click on "Install" and selecting my time zone. More testing is required to check that it is stable and then try with BigSur, which will be the ultimate test for native NVRAM, but the first impression is very positive.

If you want to change for the thrill of changing, though, C422 may not feel exotic enough coming from X299. But then C621 is a very different beast.

Unless you need the 64 PCIe lanes, W-3xxx and the restriction to a few boards (Asus Pro WS C621-64L SAGE and /10G variant, Supermicro X11SPA-T) is an expensive proposition. (If base frequency is important, but 18 cores or less is enough, CascadeLake W-22xx Xeons are the rational choice.) I would rather suggest "regular" Xeon Scalable (Skylake-X/CascadeLake-X): There are more boards to chose from, and with a second-hand CPU you may not have to sell your X299. Which is just as good because C621 is a journey.

After my first Xeon hacks on C246 (straightforward), I tried the Gigabyte C621-SU8 motherboard, with a Xeon Silver 4216 (about 500E second-hand, not bad for 16 cores). I took me months (not continuously!) to successfully hack it. Hopefully, I'll have enough time next month to make a complete write-up.
Short story: C621-SU8 works as hackintosh. Has native NVRAM. Sleeps fine.
Longer story: 180 ko of ACPI code in a single SSDT to wrap the CPU in the form that OS X expects. A few more hurdles to eventually boot a pre-existing installation but not an OS X installer. Study ACPI code of the SSDT provided by Dortania. Study the DSDT. Find that SSDT-PMC applies => Get native NVRAM, and install BigSur. But still cannot install older OS Mojave and Catalina! Many unsuccessful tries. Frustration. And serendipitous success!
While updating OpenCore I turned off all booter quirks but the one I knew is required; this unlocked Mojave and Catalina.
C621, at least on this board, actually requires much less quirks than regular consumer platforms (or C246)—and I did not expect that.

I learned a lot hacking this board. If only for that, the journey was definitely for it.
If you want a computer to hack and learn, pick up a C621 board and go ahead.
If you want a computer to use, choose an easier platform—or wait for a complete write-up. ;)
 
Last edited:
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Yeah should be simple replace. I would disable any SSDT/Device properties you had for your 5700XT first though. I believe there are 4 devices attached to the 6800XT (two are USB C) and the addresses may be different.
Yeah should be simple replace. I would disable any SSDT/Device properties you had for your 5700XT first though. I believe there are 4 devices attached to the 6800XT (two are USB C) and the addresses may be different.
Ok I deleted Device Properties and obviously no weg, I have no SSDT for GPU. I'll re-add Device Properties after booting the new GPU!
This would deserve its own thread in the appropriate section, but the thread on W-3175X is not quit suitable either, so I'll reply here.

Beside PCI lanes, the benefit of "true" Xeons (not E3/E-2xxx/W-1xxx, which are regular Core CPU with ECC support) is registered DIMM, which give access to larger capacities and cost less than UDIMM—a lot less when buying refurbished or second-hand hardware from server upgrades.
ECC never hurts, but I suspect that stability benefits mainly come from server-grade engineering of the boards and a lot of tedious, invisible, optimisations of the platform.

As you appear to not seek extreme core counts, Xeon W-2xxx on C422 would be the natural candidate for CascadeLake-W. There is a long thread on another forum on C422 boards (mostly Asus boards, but also Supermicro X11SRA-F), including working Clover and OpenCore EFI folders. There are refurbished W-21xx Xeons (Skylake) on eBay for low prices, even including the custom Xeons for the iMacPro.
I found a fair price on a CascadeLake W-2255 and bought a Fujitsu/Kontron D3598-B industrial motherboard, whose layout fits well with a modified MacPro case I had. Yesterday I dumped the ACPI tables, wrote custom SSDT for OpenCore and… watched Mojave installing without any intervention between the click on "Install" and selecting my time zone. More testing is required to check that it is stable and then try with BigSur, which will be the ultimate test for native NVRAM, but the first impression is very positive.

If you want to change for the thrill of changing, though, C422 may not feel exotic enough coming from X299. But then C621 is a very different beast.

Unless you need the 64 PCIe lanes, W-3xxx and the restriction to a few boards (Asus Pro WS C621-64L SAGE and /10G variant, Supermicro X11SPA-T) is an expensive proposition. (If base frequency is important, but 18 cores or less is enough, CascadeLake W-22xx Xeons are the rational choice.) I would rather suggest "regular" Xeon Scalable (Skylake-X/CascadeLake-X): There are more boards to chose from, and with a second-hand CPU you may not have to sell your X299. Which is just as good because C621 is a journey.

After my first Xeon hacks on C246 (straightforward), I tried the Gigabyte C621-SU8 motherboard, with a Xeon Silver 4216 (about 500E second-hand, not bad for 16 cores). I took me months (not continuously!) to successfully hack it. Hopefully, I'll have enough time next month to make a complete write-up.
Short story: C621-SU8 works as hackintosh. Has native NVRAM. Sleeps fine.
Longer story: 180 ko of ACPI code in a single SSDT to wrap the CPU in the form that OS X expects. A few more hurdles to eventually boot a pre-existing installation but not an OS X installer. Study ACPI code of the SSDT provided by Dortania. Study the DSDT. Find that SSDT-PMC applies => Get native NVRAM, and install BigSur. But still cannot install older OS Mojave and Catalina! Many unsuccessful tries. Frustration. And serendipitous success!
While updating OpenCore I turned off all booter quirks but the one I knew is required; this unlocked Mojave and Catalina.
C621, at least on this board, actually requires much less less quirks than regular consumer platforms (or C246)—and I did not expected that.

I learned a lot hacking this board. If only for that, the journey was definitely for it.
If you want a computer to hack and learn, pick up a C621 board and go ahead.
If you want a computer to use, choose an easier platform—or wait for a complete write-up. ;)
This seems too complicated for me, I'm not so skilled unfortunately, but I'll surely put an eye on your upcoming guide for C621-SU8 and then maybe I'll decide to jump in (unless the new Mac mini will prove to be a real beast of a mini machine!. Thanks for all of infos provided, much appreciated!
 
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Ok I stand corrected, if its a Kepler GK110 based card it should have support.


Have you removed the following two entries of "device properties" section in config.plist?

View attachment 522701

These lines do two things:
  1. Set the correct name for my AMD RX 560 in system profiler and;
  2. Disable the RTX 3070 in slot 1 - if your GTX Titan is in slot one that could be causing a problem.

Just remove the sections highlighted in red and let me know if it works. :thumbup:
Thank u for ur Patience ,there's nothing in my device properties Pciroot:crazy:
C39C408C-AD20-491D-B9A2-9F41D748D5A9.png


and this is my config,can u check it , I really appreciate that!!:thumbup::thumbup::thumbup:
 

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Hello everyone,

I recently updated my open core to the latest version in order to update my big sur to 11.4. Everything went smoothly but since the update, i have lost most of my USB ports (3.0) even without changing anything in the ACPI folders or in my config.plist. It's weird because i had no such issue when upgrading from Mojave to Big Sur.

I'm on Asus Sage (not 10G) X299, i think i was using the EFI from another member on the forum but this is old and i can't exactly remember where it's coming from.
 

Feartech

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Hello everyone,

I recently updated my open core to the latest version in order to update my big sur to 11.4. Everything went smoothly but since the update, i have lost most of my USB ports (3.0) even without changing anything in the ACPI folders or in my config.plist. It's weird because i had no such issue when upgrading from Mojave to Big Sur.

I'm on Asus Sage (not 10G) X299, i think i was using the EFI from another member on the forum but this is old and i can't exactly remember where it's coming from.
 
Joined
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Hello everyone,

I recently updated my open core to the latest version in order to update my big sur to 11.4. Everything went smoothly but since the update, i have lost most of my USB ports (3.0) even without changing anything in the ACPI folders or in my config.plist. It's weird because i had no such issue when upgrading from Mojave to Big Sur.

I'm on Asus Sage (not 10G) X299, i think i was using the EFI from another member on the forum but this is old and i can't exactly remember where it's coming from.

If you mapped your USB ports previously, make sure you disable XhciPortLimit in your config.plist under Kernel-Quirks. and your USB kext is enabled under Kernel-Add
 
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@djlild7hina @izo1 or anyone else. Does Resizable Bar still has to be disabled to boot macOS? Would be cool to get some extra performance in windows gaming
 
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