You don' t have to use the Stock Heat sink and Fan. All you have to do is use it once for Windows Setup( enough to melt the original Thermal Pad a bit
. Then take it off, store it back in it's original box. And then put on your Gigantic Zalman/Thermalright or Thermal Take Fan and use it for the duration. The only Thing AMD needs for an RMA is the Boxed fan and the chip. I've sent back a few Chips that way and they never know the difference. 3 yr warranty is beautiful.