The chips have 3 oscillator options: external, internal slow and internal fast. In addition, there's a2 divider that can be switched on. Bitfury recommended the slow internal oscillator if it was fast enough. The2 divider makes the clock slightly less jittery, and also allows smaller steps in clock speed.

The H-cards have an option for external clock, but it's not used on the m-board.

so there is no problem in using internal fast if it works any better? Is the speed range the same 53-57?

Where can we find an image of the SD card?  My filesystem is messed (fsck currently trying to repair...) because I powered off the rpi too often without proper shutdown.  I'm worried I may need to reflash my SD card.

I just posted dropbox links to the V1 & V2 rPi images and chainminer code if you guys need to remake your SD Cards.  Please be sure to use the correct image - especially make sure not to use the V2 image or chainminer code on a V1 board!

Check the OP for the support thread I posted (see my sig for link).

The M-boards we shipped out today are all V2, so remember that these boards use 4 distinct SPI channels.  If you have 4 hashing cards, you can load them in the slot 1 of each bank for best results.

Also be sure to use two separate PCI-e cables from your PSU to the plugs on the M-board.  Using one cable that has two plugs will just put extra load on that cable, possibly dangerous as you increase H-cards.

Tracking numbers should have come to you via email (when FedEx label was printed).  If not, I'll check with the shipping team to see whats up.

Yes, it should.  Instead of a single SPI path, there are four completely separate "banks" of 4 boards each.

Do we know which chip is which # in the .stat.log ?