Question PCIe to 4x M.2 - x16/x8 card in x4, bandwidth for each slot

[jeeaann]

Specs
CPU: Ryzen 2600
MOBO: ASRock AB350 Pro4
First PCIe 3.0 x16 with GPU, so second will work as x4

I wanted to use one of these cards:
PCI Express x16 Card to 4 x internal NVMe M.2 Key M - https://www.delock.com/produkte/1140_M-2/89044/merkmale.html
PCI Express x8 / x16 Card to 4 x internal NVMe M.2 Key M - https://www.delock.com/produkte/1140_M-2/90409/merkmale.html

For now card will work with PCIe 3.0 x4, how this would affect bandwidth when all slots are occupied with 4x NVMe drives?
When one NVMe is used it will get ~4GB/s or is it somehow "hard" splitted across currently connected drives (~1GB/s)?

Both cards uses Asmedia ASM2824 but one says Linux Kernel >=3.17, second Linux Kernel >=3.18.37, can it be just oversight?

 

[Bob.B]

Specs
CPU: Ryzen 2600
MOBO: ASRock AB350 Pro4
First PCIe 3.0 x16 with GPU, so second will work as x4

I wanted to use one of these cards:
PCI Express x16 Card to 4 x internal NVMe M.2 Key M - https://www.delock.com/produkte/1140_M-2/89044/merkmale.html
PCI Express x8 / x16 Card to 4 x internal NVMe M.2 Key M - https://www.delock.com/produkte/1140_M-2/90409/merkmale.html

For now card will work with PCIe 3.0 x4, how this would affect bandwidth when all slots are occupied with 4x NVMe drives?
When one NVMe is used it will get ~4GB/s or is it somehow "hard" splitted across currently connected drives (~1GB/s)?

Both cards uses Asmedia ASM2824 but one says Linux Kernel >=3.17, second Linux Kernel >=3.18.37, can it be just oversight?

Plug in 4 m.2 ssd's on the adapter.
Put the adapter in the slot.
Run a benchmark on each m.2.

 

[jeeaann]

Run a benchmark on each m.2.

I wouldn't ask about it if I could check it on my own.
I don't have card with more than 1x slot.