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This was off-topic but it was the first report I've seen of Z790. Thanks!

If it is a TSC Sync issue it may require that the developers of TSC Sync or AMD Sync have a look at it—which would require they have the hardware. But other observations suggest this is an issue with power states, explaining why SpeedKeeper helps. We all hope it might work, but the issues are...

So this is a power state issue… What happens if you disable C6 state in BIOS? (I'm suggesting this because TrueNAS Core, which is based on FreeBSD, requires disabling C6 to run properly on Ryzen. Maybe Darwin has the same underlying issue?)

Including the slight discrepancy between hw.cpufrequency: 4500000000 and machdep.tsc.frequency: 4499995964 ?

Nothing is dropped; this is indeed a patch… and as shown it's disabled anyway. :unsure: General purpose method, to be used by (future) Thunderbolt SSDTs among others. I wonder why USB ports are defined both by SSDTs and by kexts but @CaseySJ must know what he's doing. This is going to be very...

Alder Lake CPU have "only" 20 PCIe lanes, compared with 24 for Ryzen 7000 (16+2*4). So you're out of luck, unless a manufacturer decides on a weird splitting of these lanes instead of the intended 16+4.

This is evolving fast. Thanks for sharing—though you should probably not share your serial numbers. To be clear: This is with the same EFI(2) you shared earlier, without PCIe drives or devices other than the GPU, the OS drive is a SATA SSD and i225 does not work (nothing attached to it in...

The EFI has AmdTscSync, which has the same function and purpose as CpuTscSync. Whether either of AmdTscSync or CpuTscSync can be updated to better support Ryzen 7000 is WAY above my pay grade… (Not to mention that I follow this thread out of curiosity but doesn't have any AMD hack myself.) If...

Except for Aquantia NICs, and Intel i210 and i225. That's a lot of motherboards. Realtek NICs are fine for now. But I fear that the next step for Apple is to forbid loading networking kexts and force everything through Driver Kit (and AppleVTD).

B650 should help with that—and from what I see the second chipset in your X670 board does not expose much of what it could provide. But it will still require a solution to PCI and sound issues, plus a way to enable AppleVTD using AMD-V instead of Intel VT-d. Thanks for your contribution to...

On-board ALC4080 is an USB DAC, so the issue is deeper than that. The first IOReg posted by @PoMpIs does show a NVMe drive and the i225 NIC with interface 'en0' attached to what should be the "upstream" chipset, so the PCI situation may not be hopeless. Have the M.2 slots from the CPU been...