Obs30 Download rate of an ASI294C FITS is between 5 MB/s to about 1 MB/s.
The performance of the various versions of ASIAIR are quite varied.
We all know how slow the first generation ASIAIR (Raspberry Pi 3 based) was.
The second generation ASIAIR (based on the Raspberry Pi 4 board) will only run at 1 FPS for autoguiding with an ASI678 camera even with Bin2 and 0.5 second exposure. It can do 2 FPS with an ASI178 -- which has just a slightly smaller pixel count. So, it was right at the hairy edge of not being able to do 2 FPS synchronous image capture autoguiding at Bin 2 with the ASI678.
On the other hand, the third generation ASIAIR (based on the Raspberry Pi Compute Module 4) can autoguide at 2 FPS with the same settings.
For a 1920x1080 ROI (5ms exposure), the second generation ASIAIR comes in at 4.2 FPS for video mode with the same camera, while the third generation peaks at over 10 FPS. So, the third gen is again substantially better. As the ROI become smaller, they both top out at about the same frame rate.
I.e., for planetary, it is worth upgrading from a second generation ASIAIR to a third generation ASIAIR.
Your cost reduced Mini may be slower than either of the above due to lack of USB 3 port, and with a different microprocessor.
Chen
