MSI X870E-P Pro WIFI

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Claw5

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It's been a few years since my last build and after going Intel for what seems like forever, this time I'm thinking of going AMD.
My local Micro Center has a bundle that includes the MSI X870E-P Pro WIFI.
I've seen un-boxings and descriptions of this board online, but didn't really find anything that showed and described an actual build.
Any opinions on this board?
Any caveats I should be aware of, such as dropping the graphics card down to x8 if too many NVME drives are installed?
Thanks!
 
Installing an M.2 in certain slots will certainly bring it down to x8 depending on the slot. Unfortunately, MSI are being vague as to which slots those are. I can't tell from the manual. It comes down to how they are wired up. If they're wired to the CPU, all but the first M.2 slot (the PCIe 5.0 one) will share bandwidth with the GPU, which if present will bring the GPU down to x8.

However, if they're wired to the chipset instead, then typically those M.2 slots don't steal from the GPU lanes as they are not wired directly to the CPU in this case. They will, however, compete with everything else wired up to the same chipset (typically x4/x1 slots and SATA).

Gigabyte does a good job of explaining this in their manual:
1754932562498.png
 
Absalom said:
Installing an M.2 in certain slots will certainly bring it down to x8 depending on the slot. Unfortunately, MSI are being vague as to which slots those are. I can't tell from the manual. It comes down to how they are wired up. If they're wired to the CPU, all but the first M.2 slot (the PCIe 5.0 one) will share bandwidth with the GPU, which if present will bring the GPU down to x8.

However, if they're wired to the chipset instead, then typically those M.2 slots don't steal from the GPU lanes as they are not wired directly to the CPU in this case. They will, however, compete with everything else wired up to the same chipset (typically x4/x1 slots and SATA).

Gigabyte does a good job of explaining this in their manual:
View attachment 747335
Click to expand...
Thanks!
The way I understand it, I should be fine using only two M.2 drives, as long as I put them in the proper slots.
Thanks again!
 
On MSI website they clearly list what will happen when you use M2 slots etc.
 
Sorry to kind of Necro this thread, but did the OP figure out which slots rob from the GPU. There are 3 slots, I'm only putting MS drives in slot 1 and slot 2. The first one runs through the CPU, the other two run through the chipset? The PCI_E1 slot that I am using for the GPU is 5.0x16 the rest are currently empty. With that configuration should I be worried about any donw grade on either drive of GPU? Link to the MoBo manual: (https://download-2.msi.com/archive/mnu_exe/mb/PROX870E-PWIFI_English.pdf). Any help is greatly appreciated!

-Bege
 
I think you should be fine.
I stumbled upon this video which had a list of motherboards and indicated their various lane sharing:

View: https://www.youtube.com/watch?v=KzifWQMSKyw
If he's correct, apparently you can use all three M.2 slots on the MSI X870E Pro without losing any lanes.
Also, I could find no mention in the manual of the PCIe slots dropping down if any of the M.2 slots were populated.
 
Claw5 said:
I think you should be fine.
I stumbled upon this video which had a list of motherboards and indicated their various lane sharing:

View: https://www.youtube.com/watch?v=KzifWQMSKyw
If he's correct, apparently you can use all three M.2 slots on the MSI X870E Pro without losing any lanes.
Also, I could find no mention in the manual of the PCIe slots dropping down if any of the M.2 slots were populated.
Click to expand...

That's incredibly helpful! Thanks, Claw!
 
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