1 Solution
Believe it or not, but for me things have so far been stable with driver 20.5.1 in conjunction with Windows 10 version 2004 (May 2020 update)! I also no longer have any stability problems when waking and sleeping the computer three times using a display connected via DVI (connected to RX 5700 XT with a DisplayPort to DVI adapter). This seems to be fixed but not sure if it's due to the Windows update or the AMD drivers.
So it seems my hardware isn't deteriorated after all. 
But I'll let it go a few more days before making any final conclusions.
Hey,
For some unknown reason, it works for me when 2 monitors are connected. I share my findings in this thread:
Black screen on the first Windows boot (Nitro+ RX 5700 XT)
I did not disable hardware acceleration, apply any additional tweaks or overclock GPU.
But recently I have noticed that since 2nd monitor is connected, VRAM frequency was automatically set to 1750MHz:
If I activate manual tuning, I see it's the minimum VRAM clock speed:
But when I was using single monitor, it was around 300MHz or higher without heavy loads.
I'm on Sapphire Nitro+, seems your frequency should be at 1650MHz mark (I'm not sure). So I can recommend trying to adjust the max frequency manually and check whether it helps.
I've tried so many workarounds... None of them works for me, but solution with 2nd monitor / different VRAM clock speed (which was set by Adrenalin after connecting 2nd monitor) works like a charm. Not sure about gaming though, but I can browse >100 tabs in Chrome simultaneously, do 1440p recordings etc. Will highly appreciate if you could check whether it helps!
Noooooo! I am going to miss the Original Black Screen thread. Goodbye record breaking thread. RIP. 
I also have a bunch of .dmp files now with a similar crash like yours. One from today (picture below). Anyone interested in them? amdmatt perhaps? 
True that official Catalina support isn't there for the Mac Pro from 2010 I have, but if you install Catalina on a drive connected to a computer that supports it and then use that drive to start up the Mac Pro it works just fine, excluding the built-in WiFi witch don't have working drivers, but if one updates the Wifi card to Wifi 5 (IEEE 802.11ac) that also works fine. I'm using Ethernet, so no biggie for me.
Regarding Bootcamp and drivers, I can say that it is possible to to use Windows 10 on a Mac Pro 2010 without involving Bootcamp and it works fine to use the drivers supplied directly from Nvidia and AMD with their respective GPUs. My current Windows 10 install was done cleanly on a custom-built PC and then I simply moved the drive to my Mac Pro.
I also pretty certain that I have the exact same issues other users with non-Apple computers are having. Like I mentioned in my initial post the Mac Pro 2010 isn't much different from a other workstation PC's from 2010. The biggest differene is Apples custom EFI, I think. But When I'm in Windows 10 on this machine things behave just as they would on a non-Apple computer with similar hardware.
I will take my card back to where I bought it and they will test it and make sure that it can run stably in another computer. Hopefully I can also try a different RX 5700 XT (from another vendor perhaps) and see if that behaves any differently in my computer.
Thanks for your input and thoughts!
When you say ”…the limits that Mac puts on its devices” I you mean Apple, right?
It is true that Apple has a pretty progressive strategy with their OS – for good and for bad I'd say. With their latest OS release (Catalina) there is zero support fort 32 bit apps for example. However, for example we have a MacBook Pro (2012) that still is officially supported with Catalina – an 8 year old computer. I don't think that's bad and other computer manufacturers I doubt are much better than that. Plus Apple are pretty good at letting their older mobile devices (iPhone/iPad) get OS updates for many years. And you can always install Windows 10 on a Mac – my brother has a Mac Pro from 2006 which runs it pretty well (with an NVIDIA GPU…), so I don't think the computer is obsolete despite lacking support for the MacOS from Apple.
But – I totally agree it's impressive that Windows 10 works well on so many kinds of old hardware. But at the same time you have a legacy within the OS that I think Microsoft will have too will have to deal with sooner or later.
Anyway, about Boot Camp – at its core it really doesn't do anything too special. It consist of a MacOS application (Boot Camp Assistant) that helps to from within MacOS help partition of format a drive for installing Windows 10 onto it. Then we have the Boot Camp drivers that except for drivers for the wifi, trackpad etc. depending on the Mac model also contain graphics card drivers, but – on my Mac Pro at least – I have never been limited to any special Boot Camp drivers for the graphics. Nor have I used Boot Camp Assistant to install Windows 10 on my computer. So, I'm pretty certain – like you seem to agree – my problem has nothing to do with the fact that Apple has manufactured the computer I'm using, since we're seeing the same thing happen on non-Apple computers. And I was perfeclty stable on Windows 10 when I had a GTX 1070.
I do see there are Boot Camp specific drivers here that I could of course give a try (they are at version 19.40), though they don't mention RX 5700 XT: https://www.amd.com/en/support/kb/release-notes/apple-boot-camp
Please try this
Access violation errors (Exception code: 0xc0000005) can happen because of different reasons. Corrupted files being one of them. I was getting this error daily. After doing a fresh install of the drivers (DDU and factory reset), I'm currently testing whether or not giving RadeonSoftware.exe admin access will resolve it if it is indeed running into access issues.
I'm on day 3 with no black screen yet. At this point I'd do anything to resolve it. I also gave full access in the security tab and disabled windows "full screen optimizations". I have no idea whether this will work or not but it can't hurt. I'll do what I can until AMD finally fixes this issue.
Let us know, please.
