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Z790-E refuses to use pcie 4.0x16 and only ises x8

Captaindooguls
Level 7

20230325_075516.jpg

 I have even used gpu-z and got the same under load or not. 

Things I tried:

-Reseating gpu

-went into bios and tweak pch configuration

-moved m2_1 to m2_2

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14 REPLIES 14

Captaindooguls
Level 7

I resteated cpu as well and no go

Hopper64
Level 15

List all of your hardware for everyone to review. I wonder if using M2_2 drops the PCIe lane to x8.

MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

Z790-e motherboard 

Msi gaming trio 4090

I9-13900k

1 sn850x

Galahad aio 360

64gb G.skill trident z5 rgb 64000mz ddr5

Hopper64
Level 15

Which PCIe slot are you using for the video card?

MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

Hopper64
Level 15

Nevermind. I see the slot from the picture you posted. Consider removing the nvme drive and boot into the bios. Does that change anything?

MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

Hopper64
Level 15

The manual unfortunately doesn't tell you about lane allocation, page 1-10. Is there anything connected to the SATA ports (page 1-11)?

MZ790A Bios 2002, GSkill F5-8000J3848H16GX2-TZRK, 13900KS, EKWB D5 TBE 300, Seasonic Prime TX-1600 ATX 3.0, Asus Strix 4090 w/ Optimus block, Phanteks Enthoo Elite, Asus Claymore 2, Asus Gladius 3, Asus XG349C, Samsung 990, Windows 11 Pro

Well, I'm going to have to buy a new board because it's stuck at x8 no matter where I place my m2. Maybe there is a bios eating shopping it but I tried everything from pch configuration to x16. I think I'll save up for a hero because I can't rma this card unfortunately. 

Also, there is nothing in the sata ports.

If m2 in slot 2 like on screenshot or 1 is normal it go 8x but using m2 in slot 3-4-5 must give you 16x