Taichi x370 or x399: how many PCIe lanes do I need?

Hardware Motherboards
1

I am a bit confused by the Ryzen document I found. Hope you guys can halp me to get on the right track.

My goal is to have one GPU to run linux and some VMs in it.
I need to passthrough three NICs so I dont have to bride em.
I found one on amazon.de (iocrest si-pex24042 4 Port) that uses a single lane (X1) PCI Express for four NICs.
This will be quite handy for my purpose.

I dont need a second GPU atm.

If there will be a capture card w/ 4k I like to add that too, but atm there is none good available. And I think there wont be in the near future.

I would also love to add a NVMe Storage, but before I need to switch the MB I would drop it.

TL;DR
Can I run one GPU (x16) and a Gigabit Ethernet PCIe Network Interface (x1) with a NVMe Storage (x4) on a x370 Taichi MB ?
Will the PCIe Lanes on a x370 Taichi MB be enuff for my purpose, or should I go with the more expensive x399 Taichi ?

Happy to give more intel if necessary.

2

I think this is the right vid…

Take a look…

Some Asrock Ryzen fans roaming around :slight_smile:

You should be fine in my opinion but I have not look real closely at your config.

3

Thanks @thevillageidiot

When I get it right then the GPUs (PCIe 1x16 or 2x8) communicate with the CPU directly. So does the first M.2 Slot (PCIe x4/SATA). Those 20 PCIe lanes are pretty doable for my GPU and a NVMe Storage. The third PCIe Slot is connected to the x370 Chip which is conneced to the CPU (PCIe x4).

x370Taichi
x370Taichi.jpg1920x1080 272 KB

Hope that is right so far.
So I can run the iocrest si-pex24042 Card without any problems.
And the other lanes do not interfere with my NICs then ?
How many PCIe Lanes are left over then?

@wendell you were talking about the IO groups of the GPUs. Hope they are fixed now and we can passthough the second GPU to a VM.