I wouldn't go above 1.65v on dual core. In fact for 24/7 use I'd like to stay at 1.6 or lower. 11 is the highest multi on the 4400+. You cant go higher. Only the athlon fx series have unlocked multies. Wow, dude you are going to kill your chip. 400MHz is not the speed of the chip, it's the HTT (or the FSB if you perfer that). The speed of the chip is determined by the FSB times the multiplier. So, 400 x 11 = 4400 (4.4GHz). The minute you try to boot up with those settings prepare for your own personal fourth of july display.
so, umm, err yeah