i'm not so impressed by the 840, considering the X4 640 is about the same (but then i didn't read the review all the way and i can't find comparisons to the x4 640 - i base all this on price alone)
What's making this so tempting for me, is not that it will be FOR me. I'm planning a custom rig for my Girlfriend for her birthday, and throwing a quad core in there at a cheap price would be great so that A: I don't have to spend double that, and B: it will last her a few years.
And my bad, when I said I had a 955, I meant 965. Fat finger.