X570 Chipset PCIe Question

[Eulytaur]

Hello, I have been interested in getting a new computer for a while, and Ryzen 3000 seems super nice, but X570 has confused me a little bit with PCIe lanes. Apparently there are 40 PCIe lanes in total, 16 from the CPU, and 24 from the chipset.

I want to have one GPU, one or two NVMe drives, and one Thunderbolt 3 card (apparently some Gigabyte mobos have the headers but don't list them on the website?)

I know that the GPU will saturate the CPU's lanes,

 

So my question is: will the NVMe drives and the Thunderbolt 3 card run at reduced speeds because of the chipset PCIe?

Thanks, sorry for my stupidity.

[Mira Yurizaki]

3 minutes ago, Eulytaur said:

So my question is: will the NVMe drives and the Thunderbolt 3 card run at reduced speeds because of the chipset PCIe?

Ryzen processors have four additional lanes for generic use. This is often allocated to the M.2 slot for NVMe drives.

 

Otherwise unless the NVMe and Thunderbolt are both trying to talk to the CPU at the same time, bandwidth isn't going to really be a problem

[Eulytaur]

2 minutes ago, Mira Yurizaki said:

Ryzen processors have four additional lanes for generic use. This is often allocated to the M.2 slot for NVMe drives.

 

Otherwise unless the NVMe and Thunderbolt are both trying to talk to the CPU at the same time, bandwidth isn't going to really be a problem

Thanks! would connecting a monitor to TB 3 with an NVMe as a boot drive, would that count as both trying to contact the CPU at the same time?

[Mira Yurizaki]

1 minute ago, Eulytaur said:

Thanks! would connecting a monitor to TB 3 with an NVMe as a boot drive, would that count as both trying to contact the CPU at the same time?

If you're using the Thunderbolt as a display output, it's not using any data.

 

You actually have to provide a display output from a GPU to the Thunderbolt controller for the display output part to work.