What is the name of this connector on the backplane?

Question

SAS

I ordered the wrong Supermicro BPN-SAS-827B backplane. I can't figure out what this plug is.
46 pins in one part, 6 pins in the other. The entire connector is about 33mm, the 6-pin part is 1cm (respectively, the 46-pin part is about 25mm).
Through this connector, the backplane is connected to the motherboard
. The 6-pin part resembles Firewire-400 (IEEE-1394)

Answer 1

This is how MB-C is written connecting to the motherboard,
but in general everything is written here www.supermicro.com/manuals/other/BPN-SAS-827B.pdf