Just looked at the ASI-1600 manual (page 13).
Using a USB3 cable (and preferably writing to an SSD drive) should give you the following FPS when saving as 8-bit raws:
@ 10bit ADC Mode
640x480 125.7fps
320x240 192.4fps
@ 12bit ADC Mode
640x480 80.4fps
320x240 124.4fps
When capturing Jupiter with an ASI-094, I just set an ROI to 296x296 and exposures to 8 or 10 msec. With a C9.25 and 8 msec, you should be able to use a Gain ~300 and get an actual frame rate of at least 100 FPS.
So if you already have another guide camera for DSO imaging, I'd probably swap your 290mc for some cash.
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