Ryzen Lanes

[eternalnight]

Hi,
I have a quick question.
Amd Ryzen with am4 support 24 lanes.

 

For exemple, GIGABYTE GA-AX370-Gaming (rev. 1.0) uses 16 lanes for pci-express x16 3.0 and shares 4 lanes between pci-express 2.0 x16 and pci-express x1 slot 2 and 3.

From gigabyte description :

The PCIEX4 slot shares bandwidth with the PCIEX1_2 and PCIEX1_3 slots. The PCIEX4 slot operates at up to x2 mode when the PCIEX1_2/PCIEX1_3 slot is populated. The PCIEX4 slot operates at up to x4 mode when both of the PCIEX1_2 and PCIEX1_3 slots are empty.

 

And finally 4 lanes for the m.2.

 

However, The pci-express x1 slot 1 doesn't shares any lanes with the slot 2 and 3. Does it shares his lanes with the m.2 slot ?

[eternalnight]

Any idea ?

[Princess Luna]

Why use m.2 in the first place? just go sata3.

[Mira Yurizaki]

It routes to the chipset. All the non-graphics PCIe slots route to the chipset.

 

Edited January 2, 2018 by M.Yurizaki

[The Benjamins]

On 12/29/2017 at 7:34 AM, eternalnight said:

Hi,
I have a quick question.
Amd Ryzen with am4 support 24 lanes.

 

For exemple, GIGABYTE GA-AX370-Gaming (rev. 1.0) uses 16 lanes for pci-express x16 3.0 and shares 4 lanes between pci-express 2.0 x16 and pci-express x1 slot 2 and 3.

From gigabyte description :

The PCIEX4 slot shares bandwidth with the PCIEX1_2 and PCIEX1_3 slots. The PCIEX4 slot operates at up to x2 mode when the PCIEX1_2/PCIEX1_3 slot is populated. The PCIEX4 slot operates at up to x4 mode when both of the PCIEX1_2 and PCIEX1_3 slots are empty.

 

And finally 4 lanes for the m.2.

 

However, The pci-express x1 slot 1 doesn't shares any lanes with the slot 2 and 3. Does it shares his lanes with the m.2 slot ?

PCIe 2, 3, 4 are gen 2 being powered by the chipset.

 

out of the 24 16 go to PCIe 1, 4 go to the M.2, and 4 go to the chipset. then the chipset manages some sata, the PCIe gen2 lanes, audio, ect.