[SOLVED] 5900x & ASUS Strix X570-E PCIe Lanes

[AlexM197]

Hi,

I ordered a 5900x and the ASUS Strix X570-E Gaming mobo. I'm thinking of sticking 2 1TB NVME drives in it, but I'm a little confused about how the PCI-e lanes work.

I have a 3080, which I would definitely want to keep on x16, which leaves x4 CPU lanes. However, I the chipset has lanes which can be used for another NVME drive, at the expense of SATA lanes.

I was wondering how this works? Will having two drives limit the lanes available tot my GPU - reduce it to x8, for example - or is there another compromise somewhere?

Any help would be much appreciated

 

[rgd1101]

https://images.anandtech.com/doci/14161/X570.png
cpu have x4 dedicated to nvme drive

 

[AlexM197]

https://images.anandtech.com/doci/14161/X570.png
cpu have x4 dedicated to nvme drive

If I understand this correctly, the CPU has 4x dedicated to the NVME and 16x for the GPU. However, if I add a second NVME and, say, a sata SSD, then the chipset downlink would act as a traffic controller?

 

[rgd1101]

the second nvme will use the chipset lane. on the right side of the diagram

 

[AlexM197]

Ah, ok. I think I actually understand now. Thank you