M2 slot not working to spec.

[mwh68]

The product seems to have specs that are not correct. There are many people bringing this up, its not just me.

The original ssd and new ssd's only connect at x2 lanes. The M2 spec says key M is x4. This product is

[Bill_To]

Hi

The B550 chipset supports Gen 4 PCIe x16 for graphics, from the CPU, and Gen 4 Socket 3 PCIe X4 for the M.2 socket closest to the CPU. 

I guess HP has modified the manufacturing process for this MB: https://support.hp.com/us-en/product/hp-pavilion-gaming-desktop-pc-tg01-2000a/2100367769/document/c0... 

I see Gen 3 for graphics and one M.2 Socket 3 at the above link, which should provide up to four data lanes. HP has limited data lanes to two lanes and is probably also using Gen 3 for the M.2 socket.

[mwh68]

From the M.2 standard spec.

3.3.2. PCI Express Interface
The PCI Express interface supported in Socket 3 is a four lane PCI Express interface intended for
premium SSD devices that need this sort of host interface. Socket 3 also supports SSD devices that
make use of only two lanes PCI Express and are plugged in to Socket 2 with the aid of a Dual Add-in
Card key. See Section 3.1.2 and Section 3.1.3 for more information.