Higher board/core temps mean less stability, that's why the drop in clocks starts. The drop in voltage is to help normalize temperatures, and aim to regain the clock potential. I agree 70C is a stupidly low number, and it'll only get worse with time & dust buildup. It becomes a stupid vicious cycle, but they're keeping that board TDP <200w. ~172-195-225~ The fact that Nvidia put any limitation at all is an absolute atrocity for the enthusiast, and is probably the biggest advantage for the competition, seeing how good NV are in every other aspect. It'll be sad if HD8970 copies this. GTX 600 users should be able to get every bit of potential out of their card with voltage control - like 580's & 480's do. This ridiculous artificial limitation is easy to bypass with a hardmod though, so not everyone is upset. I've seen some dudes at XS at 1390-1450mhz with 1300mv. Kingpin & Monstru from KPC & Lab501 got to almost ~1500mhz on air; GK104 has some serious potential.