Any significance to the sticker numbers? All my Jupiter boards have a "1" and I've been running 525-550GH/s fairly consistently.
#1's might just mean that since they were first they had a little more attention to detail before they got ramped up and slopped up a bit
though, I have two #1 boards and one of them is the one with the die out but the dies that do work on them seem to drop the least cores on avg. I guess one of my VRM/caps got a little baked on the early firmwares