[Agent-A01]

To confirm, do you have a M.2 drive in the first slot?

 

[Agent-A01]

I have a total of three (3) M.2's installed. all are PCIe 4.0 types. A Samsung installed in the M.2_1 (SOCKET3) and Crucial two (2) in the DDR4 DIMM.2_SLOT. The M.2_1 (SOCKET3) is a PCIe 5 slot which is located above (under the OLED) the GPU PCIEX16(G5)_1 slot. The reason I chose all of those slots is so I can have access once I install all the EK blocks .. i.e. easy access!

So I would suggest to again RTFM like you said you know how to do.

M.2_1 shares bandwidth with PCIEX16(G5)_2. When M.2_1 is enabled,
PCIEX16(G5)_2 will be disabled

Since you have a M.2 drive in that slot, you are getting halved lanes because it shares GEN 5 lanes.
It does not matter that you have a gen 4 drive.

So the issue is not a bios bug or a gpu-z bug, only user error lol

 

[Agent-A01]

LMAO .. only one problem with your theory the GPU is installed in as I said "The RTX 4090 is installed in the PICEX16(G5)_1. 1" .. not in PCIEX16(G5)_2.

Please read carefully.

PCIEX16(G5)_2 AND M.2_1 SHARE BANDWIDTH WITH PCIEX16(G5)_1

You cannot use EITHER of those if you want PCIEX16(G5)_1 to have full x16 bandwidth.

 

[Agent-A01]

WOW .. NO! Here's a copy of the page and below that at 10 minutes using a different MOBO.

View attachment 2585691
View attachment 2585692

Are you purposely trying to pull out rebuttals? der8auer's issue and your issue isn't the same thing.

He has a faulty GPU and you have reading comprehension issues.

12/13th gen only have 16X Gen 5 PCIe lanes.
Tell me exactly how you think you are going to have 16x lanes to GPU and 4x lanes to a M.2 Gen 5 slot when there's only 16 available..

Answer is it's not possible so that's why the board internally switches the GPU to 8x when it detects either M.2_1 or 16x Gen5_2 slot is used.
16 + 4 != 16

Beyond that, if you still don't get it then oh well.

 

[Agent-A01]

Der8auer damaged his GPU by heating it up in an effort for fix a "problem' that I don't think he had. Burn this into your head .. my GPU is installed in the slot PICEX16(G5)_1 not (_2) which is the bottom PCIe x16 length slot. PICEX16(G5)_2 is Disabled. The shared bandwidth of the Samsung in M.2_1 only effects PICEX16(G5)_2.

Look and re-read my original post and then look at the page of the manual and if necessary the actual picture I posted of my PC to see for yourself.

Man you really are dense.

Der8auer tried the same card in other motherboards and had the same problem. He also tried another 4090 in the asus board and it had 16x.

As others have said, the manual (you even posted the page with the details) is quite clear. The two PCI-E slots share physical bandwidth, and the Gen.5 M.2 slot shares bandwidth with the second slot, which disables the second slot. The logical continuation of this is that with an NVMe M.2 in the Gen.5 M.2 slot, the second PCI-E slot is disabled and the first slot is reduced to x8 bandwidth, rather than x16.

This scenario is not at all uncommon on consumer boards, where the CPUs simply don't have the PCI-E lanes of the workstation/server chips and thus to cram all the features people appear to want on, motherboard manufacturers pull tricks like, "if A (enabled) then not B (disabled)" for features which it would be nice to have simultaneously. There used to be lane splitters/mux chips, but as PCI-E speeds have increased, they appear to have fallen out of favour as they are not as fast and were usually fairly expensive and with greatly increased latencies.

Inaccessible = cannot get to.
Unassessable = cannot evaluate.

No need to beat a dead horse here, the OP is hard headed and if it doesn't explicitly say it in the manual it must not be true.

 

[Agent-A01]

I get a couple of you TROLL like little children and somehow feel (LMAO) empowered. But you're both (Agent-A01) guessing and assuming, and if you were in my home / office I'd have you escorted to the curb. So go Troll someone else. I don't need or want your "help."

Here we have a great example of someone who thinks they are smarter than everyone else.

Both of us have been here for over a decade yet we are here to troll some kid because why else would we be posting here.

@ every else, just ignore this dude and move on. A new bonehead to ignore

 

[Agent-A01]

Then you seriously need to get a life. I read some of your other posts, you got a real passive-aggressive thing going on. Tell Roman he's "dense." BTW post your CPU-Z .. I got a feeling here about you.

Passive aggressive? Right, whatever you want to tell yourself 😘

Here's Roman telling you that you are wrong

"as we can see the platform is working it has to be the card(4090)"

Absolutely hilarious you keep throwing someone's words into your posts as rebuttals when you clearly didn't even watch the video you are quoting.

So either you are trolling or you're just really stupid. Your pick.

And here's my system mr. troll

 

[Agent-A01]

is it possible that while idle your gpu lowers bandwith?
mygtx 1070 on x570 taichi in idle shows PCIe [email protected], when i start GPU-z test it goes to PCIe [email protected]

To let this dead horse rest here's an updated manual for the extreme that explicitly states using the first M.2 slot forces GPU to 8x.

Let the OP rest in peace.

 

[Agent-A01]

12/13 gen cpu’s has 20 pcie lanes - 16 available for gpu in 1x16 or 2x8 config.

M.2 drive in M.2_1 will not make gpu to run at x8. In z790 extreme case problem starts when you install drive in M.2_2 since it is sharing 4 lanes with second pcie slot. That will cause gpu in top slot have only 8 lanes available. Thats is documented in manual.

Incorrect.

CPU has 16x PCIe 5.0 lanes and 4x 4.0 lanes.
On boards where they dedicate PCIe 5.0 lanes to M.2 slots OR add on card like Gen5 M.2 cards used in a PCIe 5.0 slot it cuts GPU bandwidth in half.

 

[Agent-A01]

You’r right. Imho - this is plain stupid, they should put big warning sign on motherboards top m.2 slot with explanation.

Yes it's a limitation for all motherboards that use M.2 at Gen 5 speeds due to limited CPU lanes.
At least it's updated in the manual for the extreme now "config 3" shows 8x GPU