I'm not even sure I understand the point. Maintaining stability, this card core overclocks up to 1000 MHz on my Asus model. I have it currently set at 950 MHz core and 1335 MHz memory. Temperature never reaches 85c.
I think it's a waste. Maybe if I saw something like this on a 580... at least in that one the heatsink wouldn't probably cost as much as the card itself.