Pcie lanes and m.2 adapters

Hardware Hub Motherboards
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I hope I make sense , I haven’t picked a motherboard yet but either be a b550 or x570 but If i was to populate both m.2 slots and 4 of the sata slots for hard drives.
Would there be any thing stopping me from adding a pcie m.2 adapter at a later date? I did read that some pci lanes are shared depending on the chip.

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Yes, that can happen.
There is a trope among forums like this, where the second suggestion is that you read the manual.
When browsing for motherboards, most have manuals available online to check for lane disablement, and memory channel assignments etc.

I would really suggest you heck before pulling the trigger.
You could post all the model numbers here for other people to comment on, but it is not hard to check yourself, and you are correct in thinking that some boards share lanes/disable sockets.

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Yeah you will need to check the manuals, etc.

I suspect that to use 4 SATA ports and 2 M.2 slots effectively you will want the x570 board.

I found this AMD X570 vs B550 vs A520 Chipset Comparison which seems to be good information.

The biggest reason I think you’d want the x570 is that is runs PCIe-4 on the board and from the board to the CPU. That means your second M.2 drive will be at full speed. You can also use all of your USB 10 Gbps devices at the same time.

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Also note that adapters that have multiple m.2 slots will require pcie bifurcation for the system to see more than the first drive. This will also be in the manual.

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Biggest point here, is read up the manual(s), of all boards that interest you

Dependent on the style of M.2 you use [SATA/NVMe], can exploit / reduce potential amount. Easy ex. [Mainboards 2nd M.2 Bay]: Using a SATA M.2 only consumes 1 SATA Bay [diagram to indicate, which ones get successfully cutoff], whereas an NVMe may occupy ALL [4] SATA Slots.

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Thank you for all the help, sorry for not getting back asap but I had some bad news last night

again thank you and really appreciated for all the help

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