Is that ASIC thing really indicative of anything? Or more of a snake oil thing? I looked and mine is 73.2% - but it seems weird to be able to get any type of meaningful quality indicator so easily.
I have an ASIC quality of 79.6%, which you'd think meant it was rock solid at crazy high speeds. But I can't get mine to go above 1500 mhz stable, which a lot of folks have been able to do with much lower ASIC quality.
That said, I think I'm power limited. EVGA only lets you boost the power to 110%, whereas the Gigabyte allows 130% out of the box. And that does help with OC stability.
Yes, it's real real. It doesn't really have anything to do with max OC potential though, but rather the amount of voltage you need to achieve that potential. High asic means you can get to your cards max OC without having to add a lot of voltage. So, on air cooling, high asic is good. A lower asic score can actually be good for water cooling, because you can keep the card so cool you can add a ton of voltage - to achieve the cards maximum OC.
The silicon lottery is still in play as far as OC potential. You could get a card with really high asic quality, but the most it can do stable is +100 core, you just wouldn't need any extra voltage to get there.
Alternatively you could get a card with sub 50% asic quality with a max OC potential of +600 core, but you're just gonna need a lot of extra voltage to get there, meaning extra heat, so best to water cool.