Notes on Revisions:

• 006J - hacked U37
  
  
• 006K - hacked U37
  
  
• 007B - new IC at U37, no hack
  
  
• 117A - both hacked & un-hacked models. These appear to be either hacked versions of new 006 boards that SGI had in stock or even returned boards (of any revision) that were refurbished/re-tested. The 117A sticky label appears to have been applied over a previous revision number (in almost every case) after the board was hacked, repaired, and/or re-certified (most were the 006 series, but there are some 007s too).

There are indications that some of the early Cobalt chipsets (U29) were problematic and were therefore replaced on some of the early 006 motherboards. These replacements were professionally carried out and only under intensive microscopic examination could the de/re-soldering be noticed.

It is believed that the 007 motherboards had the newer version of the Cobalt chipset from the outset. This, and the new VRM IC at U37 providing support for the Coppermine processors might have been the reason for switching production from 006 to 007 motherboards.