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Thank you. that helps.

Thanks a lot for the knowledge. I am confident with the upgrade and I just did it. Now I am on Sonoma 14.2.1 :)

Hello miliuco, do you get DRM with iMac19.1? I got it working only with imacpro1,1.

Sorry I made a mistake. My GA-X58A-UD3R is retired, existing X58 is ASUS P5X58D-E. I am still uploading its EFI here, hope you will get an idea. OC is 0.85, Monterey 12.6.3 is tested. Note you should not edit SMBIOS by GenSMBIOS or similar tools, but replacing the SN manually. The EFI is edited...

@Mr. Meoff My ga-x58a-ud3r does work Monterey. Let me try to upload my efi....

Interesting. Can you share the ssdt and other files needed to activate this GPU?

I just had a quick check, GCN1-3 GPUs are dropped too which is a big concern for me. Sad to know, it was so much fun to getting macOS work on legacy system. X58: macOS bootloops without forcing ACPI_SMC_PlatformPlugin to load via ASPP-OVERIDE.kext. LGA775: in fact I was booting 12.4 off USB...

@Jasonhacks Thanks a lot for the update. I learnt it from the hard way! My LGA775 build doesn't affect by this issue, but X58 does. I rolled back and stuck with old version for a few weeks before the solution is found. It took so long as not many people are using legacy build nowadays. Have you...

For me without proper speed stepping CPU running very lag, HWMonitor shows full speed all time but actually performance isn't, temperature is low about 30 degree. Once Speed stepping enabled temp goes to 45 degree, performance is normal. C state needs to disable in BIOS to allow speed stepping...

@Jasonhacks I rebuilt a fresh copy Big Sur, now shutdown works great. I guess some "corrupted" files left on the system due to shutdown issue happened earlier. You DSDT edit works great. Thanks a lot again for helping. @MacGeoDoc I test the SSDT shutdown edit, it works for me also...

I can make a sum up after the issue is resolved.

@Jasonhacks If I didn't explain clearly, I mean the DSDT CPU edit works with C state disabled. Without this edit CPU speed stepping doesn't work. Performance gap is huge, working Geekbench 2225/6822 single/multi-core, non-working falls to 684/5276 single/multi-core.

Thanks again for the help. Here's my report: Figured out C state needs to disable in BIOS for CPU speed stepping to work. iMac10,1, MacPro3,1 works but iMacPro1,1 doesn't. Thing's moving :) Incorrect shutdown issue still there. I dont know if it helps but I attached latest ioreg here. Other...

Looks like it works but I do not have the knowledge to do DSDT edit. are you able to help? I attached also the ioreg. The cpu is L5408, quad cores.

Hi Jasonhacks, thanks for the follow up. AppleLPC seems loaded but it doesn't fix the "incorrect" shutdown issue. More importantly, performance becomes much much slower, despite HWMonitor showing CPU runnnig at full speed but actual performance is like 10X slower... I tried swapping SMBIOS to...

Thank you very much Jasonhacks! There're some real progress, now it shutdown down with some glitches. On restart or shutdown, macOS will prompt an "unsafe" shutdown. The message is "You shut down your computer because of a problem...." If USB devcie is plugged directly to ports, it won't go...

Thanks for the reply. Yes I had these information but they don't help; in fact I followed the same guide to get started. EDIT: This one looks close but I have 9 USB controllers with _PRW in the DSDT. Any hint how to write it in this FixShutdown-USB-SSDT.dsl...

Thanks for trying to help. Here's the file. Main issue is shutdown, it would be great if that could be resolved. System spec - E5408 CPU - Asus P5Q-EM - GT730

Hi @freestart72, can I have some hints how to make USB works? I have a similar mobo P5Q-EM, mostly works but not the USB. Shutting down the machine will cause reboot instead of proper shutdown; and USB 1.1 devices are not hotplug-able, i.e. keyboard mouse.

I can give you a direct answer - mostly YES. I am running Big Sur 11.4 with MacPro 5,1 SMBIOS just fine. Same as Clover, you need to install it with compatible SMBIOS, then running with -no_compat_check boot-args. However, I have speed stepping issue even with MacPro 5,1 SMBIOS; I am stuck with...