Well, this is sort of strange.
I got 2x new GTX 770s today, and opened up Precision (I later tried Afterburner with the same effect) to boost the voltage to the max (+12 mV per BIOS).
The strange thing? It apparently is only applying the greater volt headroom to my second GPU, and the first one remains at default, no matter what I do.
I am fairly confident I am using the apps right - and there is no obvious reason why it shouldn't be working.
Does anyone else have SLI 770's and have experienced a similar thing?
**Of course, I am using the OSD to monitor the volt max for both cards.**
EDIT: I just disabled SLI (but the card remained in the case), and I still cannot get GPU0 to go above 1.2 V, according to the OSD.
Also, before anyone asks, I did set the power mode in the nV CP to be Prefer Maximum Performance.