I recently bought Asus radeon R9 290 and I got a following issue:
after starting the system all working fine untill audio driver (realtek high definition audio) boots. It immediately starts to use near 93% of GPU(according to catalyst center) and tempreture raising to 93°C.
After stopping this driver, all is working fine again, but it is a bit annoying each time to wait till driver start working and stopping it. Maybe someone had such issue and know how to fix it?