Using the extra 4x pcie lanes on 3rd gen Ryzen

[MartinIAm]

So a ryzen 5 3600 has 24 pcie lanes. I have one m.2 leaving 20 pcie lanes. Is there any way that I can run two pcie slots in 8x and run another one in 4x (all gen 3)? I have an x470 motherboard.

[Zagna]

All Ryzen CPUs have 24 PCIe lanes.

• 16 for GPU in either 16x or 8x/8x
• 4 for NVMe (or 2 SATA)
• 4 for chipset connection

So you're already using all 24 lanes.

[porina]

It is a minor gripe of mine that when listing PCIe CPU lanes many places state Ryzen has 24. It is technically correct, but not in a useful way to users. As said, there's 20 usable lanes, since the other 4 are taken by the system.

 

Generally speaking you might use 1x16 or 2x8 for GPUs or other high performance cards. The 4 for a high performance NVMe drive, and anything else goes on chipset lanes.