Oversemper:

If you are talking about ASUS ROG Strix X570-E, then this one is actually more expensive than -F version. I was deciding between non-strix x570-pro and the cheapest asus x570 board with usb flash back, which I liked very much when using my asus p8z77v-pro for 6 years already. So the cheapest asus x570 usb flash back available in the store was strix x570-f. Says it right there. 16x first PCI-e slot (x16) and the rest x4+x4. Only 24 PCI Express lanes on the flu, but I want to say four are dedicated to the chipset itself. Maybe 24 total lanes!?! Not exactly sure. I checked manual, but it is silent regarding small PCIe slots. Here is it. Slots available as listed in the manual (page 1-6): PCIe 4.0/3.0 x16_ 1 slot PCIe 4.0 x1 _ 1 slot PCIe 4.0/3.0 x16_2 slot PCIe 4.0 x1 _2 slot PCIe 4.0 x16_3 slot Ryzen 3rd gen config (page 1-7): https://osl9rg.dm.files.1drv.com/y4mXG1X1WHUhxHqDY1D8lJO1sl1owYeeld9tqAiBNQgDr1CDfU551br0JxO0eZQ-edOZYkXRu5YWqhWbAkakXAF4ITzqsrL35lY3IMwHpeZKY-HbX2AkuY6yFtaRScO3IdThlevHE5FsqAVmHOVp2EWN3aXPHywN-tuRh6W25w_H7hFi5L3jBCf2_mznwY1h3Wt-uFdxWEWNskhZ6qJR5zwuQ?width=441&height=385&cropmode=none It says nothing more about PCIe 4.0 x1_1 and PCIe 4.0 x1_2 slots nowhere in the manual.

semantics:

AMD memory specification for Matisse is 3200,

Not for my setup.....HA! J/K, but for real though my 3900X I couldn't be happier with. RAM can go to 4000mhz, but my infinity fabric doesn't want to go higher than 1900mhz, so no real gain in performance I er latency.

DeskStar:

Says it right there. 16x first PCI-e slot (x16) and the rest x4+x4. Only 24 PCI Express lanes on the flu, but I want to say four are dedicated to the chipset itself. Maybe 24 total lanes!?! Not exactly sure.

So if I insert a sound card (wanna buy esi maya44 ex) to the PCIe x1 port what's gonna happen? GPU will start working in x8 mode instead of 16x mode or one of the M.2 SSDs will go doing to x2 instead of x4. Is there a way to check it?

Oversemper:

So if I insert a sound card (wanna buy esi maya44 ex) to the PCIe x1 port what's gonna happen? GPU will start working in x8 mode instead of 16x mode or one of the M.2 SSDs will go doing to x2 instead of x4. Is there a way to check it?

Most of the time the X1 slots are off of the chipset and not the CPU.

Oversemper:

So if I insert a sound card (wanna buy esi maya44 ex) to the PCIe x1 port what's gonna happen? GPU will start working in x8 mode instead of 16x mode or one of the M.2 SSDs will go doing to x2 instead of x4. Is there a way to check it?

Do it.....

Oversemper:

So if I insert a sound card (wanna buy esi maya44 ex) to the PCIe x1 port what's gonna happen? GPU will start working in x8 mode instead of 16x mode or one of the M.2 SSDs will go doing to x2 instead of x4. Is there a way to check it?

It depend on wich port you plug it, some are CPU linked and some are chipset linked (btw it's the same with NVMe port). Normaly you will found out in your motherboard notice with all the limitation that may happen, if not, on motherboard's maker support site. exemple in my case if i would put something in PCIe 6 port, i would loose NVMe PCIe port that would reverse to NVMe SATA and loose a SATA port.