I've recently built a new machine but am having constant crashes anytime I try to do anything graphics-related. I get a number of different blue-screen reports: 

DRIVER_IRQL_NOT_LESS_OR_EQUAL

SYSTEM_SERVICE_EXCEPTION

KERNEL_something-something-I-forget-exactly

and there was another one which I forget also.

And depending on the case I have had two registers called out also: 

atikmdag.sys

dxgmm2.sys

So it -seems- to point to something Radeon-driver-related. However I haven't seen similar issues from AMD discussions so I wondered if it couldn't be board-related..

I am currently using BIOS L4.51D; I had the 4.60 on before but changed it as I thought I was getting system shutdowns randomly; appears it's just the OS shutting off the CPU fan when sleeping - seemed odd to me but ok. 

I was using a 17.x Radeon driver, upgraded to the 18.5.1 but that hasn't helped. 

Playing Youtube in 4K it will sometimes last a fair while, an hour or so or sometimes only a few minutes; then the Chrome tab may crash or the video might start going blocky or distorted, sometimes one then the other. 

Playing HEVC 265 video in VLC crashes the computer within a few minutes. Playing on MPC-HC lasted a bit longer, got up to 30mins or so. 

I have tried with multiple memory sticks (have some 2666 modules here, also tried running the 3200 at only 2133) and multiple PSUs. No tangible differences in behaviour there. 

I don't have anything happening on this machine at present; it's to be the HTPC so only a couple of media players installed, and nothing heavy yet. 

Another thing - if I enable the HDR + WCG setting in windows, the CPU grinds to almost a halt when playing a 4K HDR video in Youtube. Weird.. 

Any ideas? Bad CPU/board/driver install?

Do you have any monitoring tool installed that can check the CPU and GPU temperatures?

If so, I'd suggest taking a look to see how high the temperatures are going and see if it correlates to the crashes you're having.

An update though, I removed all AMD drivers using the AMD CLeanup Utility. Then I re-installed the graphics drivers -only- and manually using Device Manager and not the packaged installation. Full disclosure, the driver package I used for this was the amd-chipset-drivers18.10.0418 which I guess I downloaded in April; Radeon driver version actually lists the same as when installed by the new Adrenaline package release yesterday (24.20.11016.4) so that's a bit odd. Well it also says 'Driver date 16/05/2018 so I'm not entirely sure how that happened  But in any case the install was done manually through DM and not the package installer. 

Well that definitely points to the issue being driver related then.

Sorry I can't offer anything else at this point to try. Maybe reach out to AMD support if you haven't already done so.

Yeah I created the same topic at AMD Support, will see how it goes I guess. 

In the meantime I've been experimenting a little.. After first running AMD Clean util, I rebooted into Safe Mode. Before running the Guru3D DD cleaining process, when switching user from dummy to admin, system crashed & rebooted again. OK :/ This in Safe Mode still. 

Ok finally after booting back to safe mode, ran the Guru cleaner and back to Windows. 

installed "Chipset Drivers" labelled 18.10.0418. I noted that the items being installed were: 

AMD PSP

AMD SMBus

AMD GPIO

AMD Graphics Driver 24.x 

Balanced Power Plan 2.0.0

A note on these 'chipset drivers' - when installing, it says I'm using 18.10, but that there's a newer recommended version 18.5 (the adrenaline). Bit curious.. 

Allowed to install. Rebooted - Windows failed to start after two atttempts. So I stripped off all the drivers again. This time I skipped the "chipset drivers" and went straight to the new Adrenaline 18.5.1. After install I checked that all the previous components were there & with the same or better driver versions - they were. So either the driver removal didn't touch them or the Adrenaline 18.5 installs them also. 

Eventually I got the system back into its correct state. I like to tempt fate, so I went straight for HDR mode. Both Chrome & Edge crash on any YouTube video within seconds. Chrome just kills the tab; Edge actually crashes the system (although to be fair, I only tried Edge once). 

Playing videos while in HDR has given me a number of different BSODs (all in the last 2 hours): 

- SYSTEM_SERVICE_EXCEPTION

- SYSTEM_EXCEPTION_NOT_HANDLED: atikmdag.sys

- DRIVER_IRQL_etc_etc: dxgmm2.sys

- VIDEO_TDR_FAILURE: atikmdag.sys

Now I will try raw 4K with no HDR before diving into any memory & voltage changes.

I guess I'm pretty dumb then. 

After all the drama.. I try a 2666 RAM kit I have sitting here.. running at only 2133 but at least at that point (and no XMP profile) I have no issues. So I checked it up and it turns out my 3200 I've been using actually ---isn't-- on the supported list (CMK8GX4M2B3200C16R ). This isn't to say that it's the RAM's fault, per se, but.. sure doesn't help the case. I could have sworn it was listed as compatible before. :/ 

Anyone know how to check if there really is a bad match between this board (Fatal1ty AB350 ITX) and/or CPU and this Mem? Or is it just "unknown" so far? 

try using the ryzen dram calculator to suggest the sub timings to manually set for the 3200 ram

allthough im guessing your'll need to run them at 2666 or 2933 though