Seeking advice on imaging computer build (AMD Threadripper 3970X)

Hi.  I am having a large (24" f/3.3) welded aluminum Dob built, on a dual-axis equatorial platform, so it will be capable of imaging.  At 2313 mm FL after the 3" Big Paracorr, I will be able to bin my ASI6200MM pixels 3X (1.00 arc-sec/pixel) or even 4X (1.34 arc-sec/pixel), and with such large pixels (11.3 um and 15.0 um), I will be able to use really short exposures and still swamp the read noise at my 21.2 SQM imaging site.  But the downside of exposures in the 5 to 30 second range is a LOT of images to register and stack.  Each image is 120 MB, and there could easily be hundreds, if not a thousand of them to process.  My understanding is that APP can handle all of the cores and threads you can throw at it, which under Windows 10 maxes out at 32/64.  So AMD Threadripper 3970X.  My questions relate to the right amount of DRAM, how that breaks among DRAM sticks (so how many), and about the M2 SSD(s). I am currently looking to use G.Skill Trident Z Neo DDR4 3200 CL14. My questions are:

• Is 3200 CL14 (14-14-14-34) still the highest performance option?
• For 32 GB, is 4x8GB better than 2x16GB?
• Would 64 GB be better than 32 GB?  That would be 4x16GB.
• On the M2 SSD front, I am holding out for Samsungs imminent launch of their 980 Pro PCIe 4.0 M2 SSD.
• That will be available in up to 1 TB capacity.  Would that have benefits over the 500 GB version?
• My MB choice, the Asus Prime TRX40-Pro S, has room and cooling for two M2 SSDs.  Would their be any advantage to adding a second M2 drive, and putting the OS and APP on that?  If so, can I assume that it would also want to be PCIe 4.0 and fast?  What capacity would be best?

Thanks!

All the best,

Kevin