Pretty sure this is a driver issue given the findings so far.. could be wrong though, but there isn't much else in the system Specs of which are in the sig. 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?