Well that's simply it.. there's no way to cool it properly. The limitations of thermal transfer is the main issue with these reduced die sizes, and until there's a new method of transfer, or a new die design that includes the cooler with liquid flowing through the substrates.. there's not much they can do. If you don't want the chip to burn up in the case of GPU failure, then you can easily set the throttle temperature to 70, 80, or whatever you'd like so that it will downvolt/downclock to avoid exceeding your set TJMAX.