I also have a third Tube (can see it in one of the pictures, next to the two that are stacked.) This is missing a capacitor on one board (easily replaceable) but has 3 perfectly working boards (another 600GH/s.) I don't have a PSU for that one, but it will work with the controller for an easy add-on. I'll throw that in too for an extra .01BTC. In all it's like $70 bucks for around 2.4TH/s. That's a pretty good deal. You're not gunna find a better hash/$ ratio.