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Apparently, the vbios was original from the very beginning, I flashed OEM vbios and still getting the same issue...

Thank you for sharing your experience, could you please advise, are there any other changes required to the OpenCore config beyond SMBIOS change? I mean, if I take my existing configuration and adjust it with new SMBIOS iMacPro1,1 and new serials, would it work out of the box, or, there some...

I don't like that video playback significantly consumes CPU power without iGPU, this is probably because of SMBIOS iMac15,1 I am reading on the internet that it is possible to set iMacPro1,1 SMBIOS which only has dGPU, maybe in this case it would work better, can you suggest?

Is there any other reason that may cause the issue?

I bought it used, the seller claimed the firmware was never changed but I don't have any proofs, is there something I can verify to make sure I have a legit GPU?

This adjustment didn't help either... still getting the same error P.S. when I disable iGPU in BIOS I can successfully boot with RX 580 and it works fine, as I previously mentioned I can also boot successfully with iGPU only, but when both enabled I am getting this error (see attachment)

Getting the same error with this configuration...

Yes, just downloaded them all yesterday

Ok, so I just did that, successfully installed Catalina so I can boot from my SSD with iGPU only, however, when I inserted RX 580, changed BIOS to use dGPU for display, and set Platform ID to 04001204 (headless) it failed to boot with the same error as before. Any other suggestions?

Thank you for your reply, basically, you are recommending to do the installation with iGPU only (desktop platform id), and after success insert RX 580 and adjust Open Core config with a headless iGPU platfrom id. Is it correct?

Hello Hackintosh community, I am currently trying to install Catalina using Open Core 0.6.4 on the following hardware: CPU Intel(R) Core(TM) i7-4790K (iGPU Intell HD 4600) Motherboard: GIGABYTE GA-Z97X-UD7 GPU: SAPHIRE Radeon RX580 Pulse I've strictly followed this guide...

Hi all, I wanted to report back about my issue after trying various things including OC bootloader. Just to summarize, the original issue was that I wasn't able to boot into macOS without added Device Properties for iGPU (Intel HD 4600), when I did, I was able to boot into the system, however...

Thank you for your advice, really appreciate it, I plan to get a separate SSD and try to do the same with Open Core boot loader, will report when I try this

@jaymonkey thank you for the information, I also wanted to try Open Core bootloader instead of Clover to see if it makes any difference, need to get a separate SSD to test it out.

@jaymonkey I've been testing a little bit more and it doesn't seem that the issue specifically with Chrome. From what I observe system UI is freezing at random, periodically I feel some micro-lags with the mouse cursor, sometimes it happens when I launch a new program, sometimes when I swipe...

This looks like exactly what I need. Thank you for the reference. Do you have any suggestions for a specific nvm.e drive? Just curious if there preferred option for the Hackintosh and macOS in general.

@jaymonkey I have 32GB of RAM, so even though I had a lot of Chrome tabs opened I had at least 16 GB of free memory, so, I don't think this is a memory issue, it looks like something causes kernel_task to runaway and consume most of the CPU. But, I am not sure what exactly triggers that...

I see, I was thinking about this upgrade with the goal to improve disk access speed, but in your case it seems to be not so different from the regular SATA connected SSD.

@jaymonkey thank you for the advice, I will make sure to capture system logs after the restart when it happens next time.

@jaymonkey apparently it doesn't work perfectly, it was running for quite a while with no issues, but today, when I opened a bunch of Chrome tabs system UI started to lag and freeze. kernel_task occupied most of the CPU resources and it looks like it was procrastinating, eventually, computer...