My rx 480 from asus (the strix oc model) have what i would call medium coil whine. as long as FPS usually stays below 75 its so little that i have to directly listen for it. However the second it goes north of 90 it goes bad really quick(though it depends on the specific game and the load it puts on the gpu). Its connect to a corsair ax860 plat psu so the power is pretty darn clean.