Which slots to use for NVMe drives?

[ed]

Yes, this is important.
So M.2 slots are 4GB/s each = total 8GB/s
PCie 1 = Gen3 X16 = total 16GB/ss
PCIe 2 = Gen3 X4 = total 8GB /s
QM2-4P-384A output is gen3 x8 = total 16GB/s

https://nascompares.com/wp-content/uploa...68x429.jpg
So, you will want to install this card into PCIe slot 1. And make sure the cache is set up on the fastest PCIe lane.

I hope this helps.