XFX 7970 DD GHz Edition, brand new top of the line 7970 comes out with locked voltage. Even worse, I learned they did the same on the Black Edition that was released prior to that, which seems even more strange to me. Unfortunately, none of numerous reviews ever mentioned this, but it's already well known in many forums. For most obviously this surprise happens after installing their esteemed enthusiast toy.
XFX seems to be happy with this. Their support guys are great as usual, but this goes beyond my understanding. Even for those wanting to undervolt while using stock speeds, options should be limited.
Dang.