Yah, I am positive about the multipliers. When I updated the bios the only 2.6 available was in from the german site. It was linked here. So if you downloaded an english version maybe they fixed it. Or maybe my it didn't work as well as I thought.
About Palomino. The lowest voltage setting is 1.55 still, so unless you want your A4 to run as hot as current tbirds I wouldn't suggest it.