I never really needed it, but now that I'm starting to overclock, I'm curious. I've seen people posting their actual screenshots, not pictures from camera, from their UEFI Bios.
How can I do that?
I've got an AsRock Z68 Extreme 3 Gen 3.
Perhaps you might want to take a look at a similar question on Superuser. I am not sure if UEFI has any advantage over BIOS on this regard but it used to not be possible under BIOS.
Footnote: As of last year(9/14/2011 ), even Anandtech was not above posting photos of the screen.