Gigamaxx
Moderator
- Joined
- May 15, 2016
- Messages
- 6,532
- Motherboard
- GIGABYTE X470 Arous Gaming 7 WiFi
- CPU
- Ryzen R9 3900X
- Graphics
- RX 480
- Mac
I successfully installed Big Sur on my new Ryzen 5900X with a Gigabyte B550 Auros Pro AC(WiFi). The install took awhile to figure out, but I found a way to get booted and running the 5900X. The CPU frequency or bus ratio is out of whack (higher than normal) but it is running cool, and stable with very good CPU and GPU benchmarks. AMD Power Gadget is working with the latest commits.
AMD Ryzen R9 5900X, B550, RX 5700XT
Issue #1. Bus Ratio or frequency.
As you can see from scores that it is like pseudo-overclocked giving false performance readings. These benches were done at stock settings i.e. "Auto" settings in bios. In the days of old using Chameleon and clover to boot macOS we could use boot arg busratio=XX with XX being the frequency. This is no longer an option in Open Core. Most likely a kernel patch will take care of it in the future.
Issue #2. Audio is garbled and out of synch.
This is most likely tied to the bus ratio issue. Hopefully, this can be fixed in a new kernel patch to adjust and set to normal levels.
Temporary Solution: I found a solution for the garbled audio. It works suing motherboard (onboard) audio 1/8" audio jacks, but this may apply to other PCI or Usb adapters as well.
1. Go to top tool bar: Go/Utilities/Audio Midi Setup. Select your output device and select (2 ch 32-bit 98.0 MHz). Now your audio should function as normal but it will lag behind your video output. The timing or synch is off.
2. Download Google Chrome and install to Applications folder. Open App folder and drag Chrome to the bottom menu bar. This works for me, I now have audio fixed and in synch with the video.
Go>Utilities>Audio Midi Setup
Issue #3. AMD Graphics SSDT's. Graphics cards suffer a loss of performance using Ryzen in MacOS, Shanee is working on performance patches. These new Ryzen 5000 series however are currently running AMD cards pretty well. I am seeing better performance in benches for my graphics cards. Hopefully, this improvement wont get lost with a frequency fix for the CPUs.
AMD Ryzen R9 5900X, B550, RX 5700XT
Issue #1. Bus Ratio or frequency.
As you can see from scores that it is like pseudo-overclocked giving false performance readings. These benches were done at stock settings i.e. "Auto" settings in bios. In the days of old using Chameleon and clover to boot macOS we could use boot arg busratio=XX with XX being the frequency. This is no longer an option in Open Core. Most likely a kernel patch will take care of it in the future.
Issue #2. Audio is garbled and out of synch.
This is most likely tied to the bus ratio issue. Hopefully, this can be fixed in a new kernel patch to adjust and set to normal levels.
Temporary Solution: I found a solution for the garbled audio. It works suing motherboard (onboard) audio 1/8" audio jacks, but this may apply to other PCI or Usb adapters as well.
1. Go to top tool bar: Go/Utilities/Audio Midi Setup. Select your output device and select (2 ch 32-bit 98.0 MHz). Now your audio should function as normal but it will lag behind your video output. The timing or synch is off.
2. Download Google Chrome and install to Applications folder. Open App folder and drag Chrome to the bottom menu bar. This works for me, I now have audio fixed and in synch with the video.
Go>Utilities>Audio Midi Setup
Issue #3. AMD Graphics SSDT's. Graphics cards suffer a loss of performance using Ryzen in MacOS, Shanee is working on performance patches. These new Ryzen 5000 series however are currently running AMD cards pretty well. I am seeing better performance in benches for my graphics cards. Hopefully, this improvement wont get lost with a frequency fix for the CPUs.
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