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Z690 Formula - Video running x8

TZero
Level 8

‎12-20-2021 04:22 PM - last edited on ‎03-05-2024 06:47 PM by Community Admin

I am very confused and I need your help.
My setup is:
- z690 Formula (BIOS 702)
- 32Gb Corsair 5200 ram (2x16)
- 1 NVMe (connected to slot M.2_1 - CPU)
- RTX 3090 (connected to PCIEX16 slot (G5)_2 (not to overheat the NVMe)

Why the video card appears at x8 speed ???? The three PCIEs are not x16 ???

When use Nvme M2_1 + Video PCIEX slot (G5)_1, Video = x16
When use Nvme M2_1 + Video PCIEX slot (G5)_2, Video = x8

I failed to configure something in the BIOS ???

Thank you in advance for any guidance.
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4 REPLIES 4

Falkentyne
Level 12

‎12-20-2021 06:28 PM

Please read the motherboard manual. It's there for a reason.
The 2nd PCIE slot will never run at x16. When populated it will run at x8 (shared with PCIE slot 1 x8).
Lane configuration is x16/x0 PCIE1, x8/x8 PCIE1 + PCIE2. x0/x16 is not a valid configuration.
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TZero
Level 8
In response to Falkentyne

‎12-20-2021 06:36 PM

Falkentyne wrote:
Please read the motherboard manual. It's there for a reason.
The 2nd PCIE slot will never run at x16. When populated it will run at x8 (shared with PCIE slot 1 x8).
Lane configuration is x16/x0 PCIE1, x8/x8 PCIE1 + PCIE2. x0/x16 is not a valid configuration.



I appreciate your willingness to explain. Thank you very much. 😉

Honestly, I searched the manual several times and only found reference when using the ROG M2 Card.

I'm just disappointed why then in the manual does it refer to 3 x16 slots?
Anyway, I thank you again for your patience.
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OutSider420
Level 9
In response to TZero

‎12-20-2021 06:59 PM

TZero wrote:
I appreciate your willingness to explain. Thank you very much. 😉

Honestly, I searched the manual several times and only found reference when using the ROG M2 Card.

I'm just disappointed why then in the manual does it refer to 3 x16 slots?
Anyway, I thank you again for your patience.


You missed this part then

2 x PCIe 5.0 x16 slots (supports x16 or x8/x8 modes)**
Intel® Z690 Chipset***
1 x PCIe 4.0 x16 slot (supports x4 or x4/x4 mode)***
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TZero
Level 8
In response to OutSider420

‎12-20-2021 07:07 PM

OutSider420 wrote:
You missed this part then

2 x PCIe 5.0 x16 slots (supports x16 or x8/x8 modes)**
Intel® Z690 Chipset***
1 x PCIe 4.0 x16 slot (supports x4 or x4/x4 mode)***


I thank you too.
I think I fell into the marketing trap.
I thought I had 3 x4 native M.2 slots (actually there are only 2 - you have to use the PCIEX together with the ROG CARD) // 4 PCIEX x16, which actually aren't either.......I'll end up selling this board on Aliexpress
:confused:
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