Originally Posted by
Jonj1611
As above it is apparently a X4 interface for PCIe 4 which is half the bandwidth of PCIe3 x 16
Eh? From the product specifications on the web page:
Code:
AMD Ryzen series CPUs (Vermeer and Matisse)
- 2 x PCI Express x16 Slots (PCIE1: Gen4x16 mode; PCIE3: Gen3 x4 mode)*
AMD Ryzen series APUs (Cezanne and Renoir)
- 2 x PCI Express x16 Slots (PCIE1: Gen3x16 mode; PCIE3: Gen3 x4 mode)*
AMD Ryzen series APUs (Picasso)
- 2 x PCI Express x16 Slots (PCIE1: Gen3x8 mode; PCIE3: Gen3 x4 mode)*
1 x PCI Express 3.0 x1 Slot
- Supports AMD Quad CrossFireX™ and CrossFireX™
- 15μ Gold Contact in VGA PCIe Slot (PCIE1)
- 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe WiFi module
and this is a Matisse cpu, so PCIe1 is x16 Gen 4 (which is exactly what I would expect on a B550).
So slot 3 is x4, and also PCIe gen 3 (but then that's good enough for both the PCIe IO cards I have in this box).
It's all good.