Well as of 5 minutes ago my laptop doesn't make a sound. The technician just left. He came to my work place and did his thing. So far it's performing really well.
My original m1330 the whine was too loud to determine where it came from. The replacement the whine came from two places. A faint whine from the top left, and a loud whine from the bottom right.
The motherboard was replaced on the replacement with an a04 board and now it's silent. Even if i put my ears next to the laptop i hear nothing.
The technician was good too, he asked for somewhere to sit down because, "the m1330 is very finickey." I got my boss to get him a desk close to where i work and about 30 minutes later he called me to inspect. So far, so good.
So this whine got me a free 2 year warranty upgrade (with next business day reparis) and, if things continue the way they are now, a very silent notebook.
I'm happy as hell right now that i chose
dell 
.
Edit:
Oh yeah, and the screen on this one is superb!!
Edit2: Although i appear to have no more whine, i voted southbridge, because that was the loudest whine.
Edit 3: Oh sh1t-cakes. It's whining again. bottom right. And well it was quiet for a couple hours. Lol.