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( PLEASE HELP ) M.2 - GPU PCIE ISSUES

If anyone has any knowledge on what's going on with my system here. I have a 13900k and a z790-e motherboard. My gpu will not run at 16x once so ever, I have tried so many different options. My M.2 is a 4tb gen4 sn850x, so that should only use 4x lanes no?? Yes I understand that the difference right now between 16x and 8x on the gpu can be very little if not nothing, but why leave that extra 1-5% on the table when it can be used. How come the gpu can’t run at 16x and the M.2 can't take the last 4x out of the 20x the 13900k has? I know the cpu comes with 16x gen 5 and 4x gen4 but it still says the gpu will use the 16x gen5 and convert it to 4x. Thank you to anyone who can help me out. I am quite tired of trying to find an answer online so I thought I'd ask myself.

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Gpu is a 4080 Super - Tuff Gaming Oc

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1 minute ago, NoVoAo said:

Gpu is a 4080 Super - Tuff Gaming Oc

Look up your motherboard manual. It will tell you about the slots. 

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3 hours ago, BillBill said:

Look up your motherboard manual. It will tell you about the slots. 

I have done this. I just maybe don't understand why Intel has to be so stupid with their cpu designs.

 

 

Would anyone else have any idea on a fix? Or is this just the limits of a 850$ Cpu....

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1 minute ago, NoVoAo said:

I have done this. I just maybe don't understand why Intel has to be so stupid with their cpu designs.

 

 

Would anyone else have any idea on a fix? Or is this just the limits of a 850$ Cpu....

Some motherboards if you have a NVMe m.2 drive in the 5.0 PCIe slot it can make the PCIe for the GPU go from x16 down to x8. 

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1 hour ago, BillBill said:

Some motherboards if you have a NVMe m.2 drive in the 5.0 PCIe slot it can make the PCIe for the GPU go from x16 down to x8. 

Are you sure?  That would be odd as there are plenty of planes to avoid this needing to be done.  I certainly wouldn't expect a z790-e to do this.

 

4 hours ago, NoVoAo said:

If anyone has any knowledge on what's going on with my system here. I have a 13900k and a z790-e motherboard. My gpu will not run at 16x once so ever, I have tried so many different options. My M.2 is a 4tb gen4 sn850x, so that should only use 4x lanes no?? Yes I understand that the difference right now between 16x and 8x on the gpu can be very little if not nothing, but why leave that extra 1-5% on the table when it can be used. How come the gpu can’t run at 16x and the M.2 can't take the last 4x out of the 20x the 13900k has? I know the cpu comes with 16x gen 5 and 4x gen4 but it still says the gpu will use the 16x gen5 and convert it to 4x. Thank you to anyone who can help me out. I am quite tired of trying to find an answer online so I thought I'd ask myself.

Where are you reading how many lanes are in use?  GPU-Z?

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I think some might. Depending on how many m.2 slots the motherboard has. 

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On 6/18/2024 at 8:44 PM, Alex Atkin UK said:

Are you sure?  That would be odd as there are plenty of planes to avoid this needing to be done.  I certainly wouldn't expect a z790-e to do this.

 

Where are you reading how many lanes are in use?  GPU-Z?

yes sir gpu-z

 

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Someone suggested switching it to the second m.2 slot and maybe it will give my gpu the 16x back

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58 minutes ago, NoVoAo said:

Someone suggested switching it to the second m.2 slot and maybe it will give my gpu the 16x back

Its worth trying, but I believe that will come from the chipset.  But I suspect the M.2 is not the issue here as the PCIe 5 M.2 socket should be using its own CPU lanes and have no relation to the x16 slot.

 

I'd be tempted to check if your CPU cooler is too tight, maybe some of the PCIe lanes are not connected properly.

ASUS B650E-F GAMING WIFI + R7 7800X3D + 2x Corsair Vengeance 32GB DDR5-6000 CL30-36-36-76  + ASUS RTX 4090 TUF Gaming OC

Router:  Intel N100 (pfSense) Backup: GL.iNet GL-X3000/ Spitz AX Switches: Netgear MS510TXUP, MS510TXPP, GS110EMX
WiFi6: Zyxel NWA210AX (1.7Gbit peak at 160Mhz) WiFi5: Ubiquiti NanoHD OpenWRT (~500Mbit at 80Mhz)
ISPs: Zen Full Fibre 900 (~930Mbit down, 115Mbit up) + Three 5G (~1200Mbit down, 115Mbit up, variable)
Upgrading Laptop/Desktop CNVIo WiFi 5 cards to PCIe WiFi6e/7

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16 hours ago, Alex Atkin UK said:

Its worth trying, but I believe that will come from the chipset.  But I suspect the M.2 is not the issue here as the PCIe 5 M.2 socket should be using its own CPU lanes and have no relation to the x16 slot.

 

I'd be tempted to check if your CPU cooler is too tight, maybe some of the PCIe lanes are not connected properly.

I will give this a try and get back to you! Thank you. I should let you know I have a 13th gen anti bend bracket on the cpu? so no matter what the cpu "should" be seated properly. Still I will try it out:)

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