Just wondering for the sake of argument say that the project GOT these chips..what would we be looking at for speed etc if it was made like the current USB stick project
I think sidehack was reluctant on another stick, but the limits - as with the BM1384 - would mostly be in power drawn and heat you can dissipate. A very naive conversion from the datasheet (hopefully we'll see more data points in an update / from actual use) taking into account a bit of losses gives ~2.25A at the cited 38.75Gh/s (the S7 seems to run them at 30Gh/s stock). The Compac with BM1384 handles 2A+ like a champ with a bit of active cooling.
If somebody has happened to have found MHz => Gh/s multiplier for the BM1385 (datasheet, website, marketing don't seem to state or reveal) you could run some numbers against the frequency table in the datasheet.