Well, another batch of tests here.
I bought a NVME SSD, so the cheap adapter linked above would not work. Opted to sell this SSD and buy a new one...
Opted for a regular sized 2.5" SSD.
Got much better speeds with this new setup, using simpler (cheaper) parts, tested only Raw 16 bit export and got 13 fps, not the 18 fps stated above, but I can test EXT3 file system and other types of exports to check speeds... Anyway, happy with the results for now.
The question remains whether a M2 (not NVME) would result in better speeds...
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DNG saves at about 12FPS on the 2.1-HD and about 18FPS on the 1.4, at full resolution.
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Well, i just read that again, and tesla500 states 12fps for the 2.1 at full res. The 18fps you are thinking about where actually for the 1.4 Save-Speeds.
So, with 13fps you are allready better than what he said.
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I finally got myself an m.2 with an Adapter (also first got an NVME one, which wont work with the Cheap Adapters, needs to be an NGFF M.2 ...) and i am getting around 10fps Average for DNG; a bit over 10fps (like 10,5 average) for Raw16; about 13fps Average for Raw12; and 25fps Average for H.264 (full Resolution Saves on the 2.1)