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12-26-2022 08:00 AM
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.
12-26-2022 08:22 AM
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.
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