It was a normal reboot via the Start menu. Quite certainly a cold reboot will wipe GPU RAM, but that's beside the point that software should make sure that unp

It was a normal reboot via the Start menu. Quite certainly a cold reboot will wipe GPU RAM, but that's beside the point that software should make sure that unprivileged software from one OS should be able to read privileged contents from another if the first one had all the chances to wipe it from memory. Alternatively the GPU or driver could, at initialisation time, wipe the memory.