MSI MAG B550 PCI_E1 Gen Switch setting

[Kevinjr12]

In the bios for my MSI MAG B550 tomahawk there is a PCI_E1 Gen switch setting. By default it is on auto, but I can also choose (1.0, 2.0, 3.0, or 4.0). Since I want to use PCIe 4.0 should I switch it to 4.0? On HWiNFO64 when set to auto I see 2.5 GT/s and sometimes 16 GT/s when set to auto, does auto switch the gen and bandwidth settings on the fly? 

[GuiltySpark_]

If you have a PCIe 4.0 GPU and aren't using a 3.0 riser cable, just leave it on Auto. You can check GPU-Z and do the built in test to check its negotiating correctly. 

[GuiltySpark_]

Notice how it says 1.1 while my system is idle? That jumps to 4.0 when necessary which you can test if you click Start Render Test.

 

 

[Kevinjr12]

58 minutes ago, rickeo said:

Notice how it says 1.1 while my system is idle? That jumps to 4.0 when necessary which you can test if you click Start Render Test.

 

 

Thanks!