Gigabyte Z490 Vision D (Thunderbolt 3) + i5-10400 + AMD RX 580

[Higgie]

Just something to try, if you feel so inclined, since I have been having alot of problems with my 1tb SX8200 Pro in the 3rd M2P slot:

You can try to move your SX8200 Pro to the first or 2nd M2 slot and boot again, leaving the 3rd slot empty. See if that helps at all possibly.

May be a PITA though, since you'd most likely have to remove your GPU to do it, but just something to try if all else fails.

Thanks for your suggestion. Yes it would be a bit of a nightmare. Reaching the tab to pop the GPU out is a bit of a pain with the Noctua NH-D15S! Might be worth a try though. I tried disconnecting my SATA drives (as verbose indicated it was hanging at something to do with Disk3s2) but still got the standard boot time of ~35 seconds. This is so weird!

Maybe the best thing to do is just swap their names, and have the Adata as the backup

Edit: Removed the GPU, moved both M.2 drives up a slot (Windows 10 in the 1st slot, MacOS in the 2nd) and rebooted. Boot time still the same. As a side note, GPU still reads at x8 even though its been reseated - it seems I can't get it to run at x16 no matter what. Last week when I cold booted in the morning two days in a row, it was x16 in BIOS, then x8 once I'd loaded MacOS or Windows. Now its just x8 all the time. Absolutely stumped by all this!

 

[Higgie]

Here's an excerpt from a new bootlog. Hopefully it'll be some help in diagnosing the problem.

 

[CaseySJ]

Here's an excerpt from a new bootlog. Hopefully it'll be some help in diagnosing the problem.

Here we can see that probably everyone has a delay at wifiFirmwareLoader. In your case the delays are 17 seconds from the first log and 14 seconds from the second log. For me, the delay is 10 seconds.

Wondering installing AirportBrcmFixup.kext might help. Will try shortly.

 

[Higgie]

Here we can see that probably everyone has a delay at wifiFirmwareLoader. In your case the delays are 17 seconds from the first log and 14 seconds from the second log. For me, the delay is 10 seconds.

Wondering installing AirportBrcmFixup.kext might help. Will try shortly.

View attachment 484755

Interesting to see that you have the same delay, but there's no delay when I boot from the SATA SSD. I just reformatted my SX8200 Pro and restored from my backup to see if that changed anything, but sadly, no change! Definitely seems to be an issue with using the NVME drive instead of the SATA as a boot drive.

 

[CaseySJ]

Interesting to see that you have the same delay, but there's no delay when I boot from the SATA SSD. I just reformatted my SX8200 Pro and restored from my backup to see if that changed anything, but sadly, no change! Definitely seems to be an issue with using the NVME drive instead of the SATA as a boot drive.

After installing AirportBrcmFixup 2.0.8, delay appears to be reduced from 10 seconds to 6 seconds. Curious if it will have any impact on your system.

To install, copy the kext into OC/Kexts and add an entry to the Kernel section:

 

[Higgie]

Made no difference for me unfortunately!

 

[CaseySJ]

Made no difference for me unfortunately!

I'm booting from a Sabrent Rocket NVMe SSD installed in the bottom (M2P) slot. Only 6-10 seconds of delay. However, I must also say that log entries are asynchronous, so the "delay" does not mean the system is stalled because other threads continue to run. But because you're noticing an actual measured delay (i.e. using a stopwatch) when booting from NVMe versus SATA SSD, then there is something there. But I would not really worry about it.

Total boot time from OpenCore Picker to macOS Login Screen: 24.55 seconds

 

[Higgie]

I'm booting from a Sabrent Rocket NVMe SSD installed in the bottom (M2P) slot. Only 6-10 seconds of delay. However, I must also say that log entries are asynchronous, so the "delay" does not mean the system is stalled because other threads continue to run. But because you're noticing an actual measured delay (i.e. using a stopwatch) when booting from NVMe versus SATA SSD, then there is something there. But I would not really worry about it.

I guess an extra few seconds at boot is nothing to worry about. Just annoying that an SSD I bought 6 years ago and had in my old MacBook Pro boots my new system twice as fast as a brand new M.2

The more pressing issue for me is why my GPU is only running at half lane width. Can't seem to find anything online!

 

[CaseySJ]

I guess an extra few seconds at boot is nothing to worry about. Just annoying that an SSD I bought 6 years ago and had in my old MacBook Pro boots my new system twice as fast as a brand new M.2

Understandable.

The more pressing issue for me is why my GPU is only running at half lane width. Can't seem to find anything online!

This is the more perplexing issue. Maybe fixing this will fix the NVMe startup time as well. Seems like a PCI bus problem. If Gigabyte has not been helpful, I wonder if it's worth exchanging the board. Are you within your return/exchange window?

And have you tried a different AMD GPU?

 

[Higgie]

This is the more intriguing issue. Maybe fixing this will fix the NVMe startup time as well. Seems like a PCI bus problem. If Gigabyte has not been helpful, I wonder if it's worth exchanging the board. Are you within your return/exchange window?

I bought all the hardware at the end of June - I'll check and see. As everything still "works" I figured I'd just make do with it, but it's annoying me more and more that it's all not working as it "should".

And have you tried a different AMD GPU?

I haven't. This being my first build, I don't have access to any other hardware. Due to the Coronavirus and being a musician, I've had no income since March, so putting this computer together was a stretch in the first place - Otherwise I probably would have just bought another Vision D/RX580 to diagnose the problem, then sent back the faulty (if any) components.