can't run gpu with 16x help

mexi95 · Aug 24, 2020

Hello to everyone , i have this pc config moba: asus formula xi z390 gpu : asus 2080 ti strix ssd nvme samsung 970 pro, and my gpu is running at 8x instead 16x , and can't change it from the bios , can anyone help me ?
it's not my first build i have this problem only in this config

micropage7 · Aug 24, 2020

which slot you plug the card?
1st slot or 2nd slot?

mexi95 · Aug 24, 2020

slot 1

Caring1 · Aug 24, 2020

Is there anything in the other PCI-e slot?
It runs at x8/x8 if two slots are populated.

mexi95 · Aug 24, 2020

Caring1 said:
Is there anything in the other PCI-e slot?
It runs at x8/x8 if two slots are populated.

no nothing only the things in my config

ThrashZone · Aug 24, 2020

Hi,
You might check which mode your m.2 is in and possibly switch m.2 slots used.

mexi95 · Aug 24, 2020

For what I know this moba can handle 2 m.2 with the 16x in the gpu , for change it have to empty the water cooling system , it’s a pain in the ... before doing it want to be sure

Any hint ?

ThrashZone · Aug 25, 2020

Hi,
I returned a z490 formula for a z490 apex for a few reasons but most was the lame m.2 layout
2nd was this platform does not need a vrm water block.
3rd memory oc is better on apex.
4th saved 100.us

Ruru · Aug 25, 2020

Using a M.2 NVMe SSD shouldn't affect the 1st slot. Usually just on cheaper boards it could disable some SATA connectors but that's not the issue here.

mexi95 · Aug 26, 2020

I asked to ASUS to help me and they said the cpu has only 16 lanes , and using a nvme I’m using 4 lanes from those 16

bug · Aug 26, 2020

mexi95 said:
I asked to ASUS to help me and they said the cpu has only 16 lanes , and using a nvme I’m using 4 lanes from those 16

Hm, what CPU is that?
And if that's the case, just move the SSD to the other M.2 slot.

Deleted member 24505 · Aug 26, 2020

I'm using a z390-f and have 2x PCIe M2 and gpu is still at 16x using both M2 slots. I have sata controller disabled in the bios though if that makes a difference.

kayjay010101 · Aug 26, 2020

bug said:
Hm, what CPU is that?
And if that's the case, just move the SSD to the other M.2 slot.

Yeah, OP's right. Z390 would be 9th gen Intel, and they're limited to 16 lanes according to ARK. So using a CPU-connected M.2 slot will turn the GPU to x8 mode. If you've got more than one M.2 slot I'd suggest using another one, OP. Check the manual to see which ones are connected to the chipset, use them.

mexi95 · Aug 26, 2020

I have 9900k

tigger said:
I'm using a z390-f and have 2x PCIe M2 and gpu is still at 16x using both M2 slots. I have sata controller disabled in the bios though if that makes a difference.

Can u help me how to do it ?

kayjay010101 said:
Yeah, OP's right. Z390 would be 9th gen Intel, and they're limited to 16 lanes according to ARK. So using a CPU-connected M.2 slot will turn the GPU to x8 mode. If you've got more than one M.2 slot I'd suggest using another one, OP. Check the manual to see which ones are connected to the chipset, use them.

The manual do specify it

ThrashZone · Aug 26, 2020

Hi,
You really haven't showed any proof you're running at x8
Use gpu-z and at least show a screen shot saying it is

mexi95 · Aug 26, 2020

As soon I’m going at home I’ll dimostrate at u

ThrashZone · Aug 26, 2020

Hi,
That would be nice because you saying it just is not enough anymore.
Screen shot I show is just too darn easy to show.

Toothless · Aug 26, 2020

Make sure there is a load on the GPU when you get the screenshot or all we'll see is the card on idle.

mexi95 · Aug 26, 2020

I can demonstrate to you from the bios , is set the gpu set in 8x and can’t change it

Deleted member 24505 · Aug 26, 2020

how could i tell if my M2's are using cpu or chipset PCIe lanes? as i have 2xPCIe M2's and GPU is still at 16x My CPU is 9th gen so i am assuming only 16 lanes as someone stated up there ^

Toothless · Aug 26, 2020

tigger said:
how could i tell if my M2's are using cpu or chipset PCIe lanes? as i have 2xPCIe M2's and GPU is still at 16x My CPU is 9th gen so i am assuming only 16 lanes as someone stated up there ^View attachment 166765

BIOS

mexi95 · Aug 26, 2020

ThrashZone said:
Hi,
You really haven't showed any proof you're running at x8
Use gpu-z and at least show a screen shot saying it is

View attachment 166752

Is running v 1 voice ? It’s like 2 lane

kayjay010101 · Aug 27, 2020

tigger said:
how could i tell if my M2's are using cpu or chipset PCIe lanes? as i have 2xPCIe M2's and GPU is still at 16x My CPU is 9th gen so i am assuming only 16 lanes as someone stated up there ^View attachment 166765

x16 1.1? Is this under load? If that's under load, something's wrong. That's the equivalent of 4x 3.0 lanes in bandwidth, which would severely hamper the performance.

Deleted member 24505 · Aug 27, 2020

kayjay010101 said:
x16 1.1? Is this under load? If that's under load, something's wrong. That's the equivalent of 4x 3.0 lanes in bandwidth, which would severely hamper the performance.

Mines not 1.1, mine is 3.0

kayjay010101 · Aug 27, 2020

tigger said:
Mines not 1.1, mine is 3.0

It clearly states "It is currently running at: PCI Express x16 v1.1" in that red box in the picture. Although that might just be power saving at idle

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Motherboard	z490 Maximus XII Apex \| x99 Sabertooth
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Memory	Trident-Z Royal 4000c16 2x16gb \| Trident-Z 3200c14 4x8gb
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can't run gpu with 16x help

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