Nike_7688
Only the first M.2 slot is Gen 4, direct from the CPU (assuming you don't use pci-e slot 2). That gives 20x pci-e Gen 4 lanes. There are 8 lanes allotted to the chipset that are basically Gen 3 pci-e under the hood, but they call it something else. If you use Pcie slot 1 at 16x and m.2-1 at 4x, than the rest of the m.2 slots are sharing a gen-3 speed 8 lanes with all the other devices that the chipset uses (USB, sata(?not positive on sata).

Nike_7688

rblaes_99
wait what?  If i run 2 NVME drives my GPU is dropped to 8x?  is this right?

Not necessarily. It all depends on what you're running and how you set it up. Here's a hypothetical for you:
11900k+
GPU x16 gen 4 PCI-e slot 1
m.2 x4 gen 4 in M1 slot
m.2 in M2 slot (shares 8x DMI lanes with chipset)
m.2 in M3 slot (shares 8x DMI lanes with M2 and chipset)
 
The comment I made above about reducing to 8x was with a 10900k (or 9900k, or 8700k). They only have 16x PCIe lanes and 4 DMI lanes. If you run a 10900k on a z590 board, I think you still get the 8x DMI lanes, but you don't get 20x PCIe lanes and I don't believe anything will run at gen 4 speeds. So you can run your GPU at x16, but then all the m.2's will share the 8x DMI lanes (just like they'd share the 4x DMI lanes on a z490 platform unless you ran your GPU at 8x and allotted 8x of your CPU's direct PCIe lanes to storage).

Nike_7688
That would make way more sense than anything I've read in articles so far lol. Where can I find that information detailed?

Nike_7688
Ok. So the dmi is still a factor in that it is the path between the chipset and the cpu. So I was wrong to describe it as "lanes" the way I did, but it does sort of still work that way in a manner of speed. They just aren't dedicated like pci-e lanes normally are. I also didn't know if the 8x dmi bandwidth was a chipset or cpu spec and if you'd still have that with 10th Gen on a z590.

Nike_7688
Well I'm glad you got to this thread and filled in all the blanks I left (and a couple needed corrections lol). Thanks!

Nike_7688
 
OK, back to Frankd3: the x16, x8/x8, x8/x4/x4 breakdown you showed is only related to the gen 4 PCI-e lanes from the CPU and generally targeting the PCI-e slots themselves. I don't think PM2 or PM3 can use any of those. They're just using the chipset. This is made clear by indicating that they cannot use Gen 4 lanes. I don't know if you can have the other PCI-e slots use the x4 gen 4 lanes intended for storage or not because they've clearly set this up so that those are used by PM1. I'm just curious if you disabled PM1, what happens. They also make it clear that PCI-e slot 3 uses the Gen 3 chipset lanes, not the gen 4 CPU lanes. So that means the normal x8/x4/x4 usage is not an option on this board, so you are limited to either x16 in pci-e slot 1 (with no PE2 slot usage) or x8 in slot 1 and x8 in slot 2. 
 
Another note there is that only PM2 slot accepts SATA M.2 drives. PM1 and PM2 only accept PCIe M.2 drives.
 
So with all that, you should still be able to do:
PE1: x16 graphics card
PE2: empty
PM1: x4 gen 4 NVMe drive
PM2: x4 gen 3 NVMe drive
PM3: x4 gen 3 NVMe drive.
Possibly also: PE3 x4 gen 3 NVMe drive in an adapter card.
 
If you put something in PE2, it will reduce both PE1 and PE2 to 8x each. Edit: It is...possible...the way they've worded the manual I can't really tel...that if you alternatively leave PE1 empty and put something in PE2, that PE2 could then be x16. *shrugs*

EVGATech_LeeM
Well, this has been a fun thread.
 
Only things to note about the Z590 FTW WIFI that hasn't been covered here are:

1. An 11th Gen CPU is needed to use PM1.  PM1 will not function with a 10th Gen CPU (PM2/PM3 still work, though).
2. PM1 and PM3 do not share lanes.  Use one or both without affecting performance.
3. PE2 electrically works at Gen4 x8 speeds max with an 11th Gen CPU.  Gen3 x8 max with a 10th Gen CPU.