Also, I got rid of:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
in my batch file. Is this necessary any more or not? Seems to make no difference either way.
Yes, but they come in effect after first run and logoff/reboot or immediately. No need to set them again and again.
Tho, x11/x13/x15 barely use GPU RAM, so prly GPU_MAX_ALLOC is not required at all.