Questions about G.Skill RipjawsX

I think this is not possible, they sell it in a double pack.

No, I don't think that fits. The M740 (if the original mainboard D3348-A2x is installed) does not support DDR3 RAMS, only DDR4. Please keep an eye out for DDR4 RAMS. The RipJawsX you are looking at is a DDR3 RAM. And be careful, if a Xeon processor is installed, probably only ECC RAMs will work. Try to find out what kind of mainboard and what kind of processor is installed. It's all in the BIOS/UEFI. Good luck Link to the suspected board: https://sp.ts.fujitsu.com/dmsp/Publications/public/DS-D3348-B.pdf

2x8=16. In that case, yes.

The bars run in dual mode and are completely in order, so far no failures have occurred.