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Lane allocation

Hopper64
Level 15

‎04-19-2019 01:44 PM - last edited on ‎03-06-2024 08:22 PM by Community Admin

I’m considering a M11E with a 9900k but I wanted to know about lane allocation. If I use a sound card in the very top x1 slot with an x16 video card in PCIe slot 1, will the video card drop to x8 if I use only 1 m.2 in the dimm.2 slot? The manual suggests it would drop to x8 since there are only 16 lanes for the CPU. The first PCIe slot would share bandwidth with the dimm.2. Correct?
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
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Enderwiggin03
Level 7

‎04-19-2019 02:19 PM

Hopper64 wrote:
I’m considering a M11E with a 9900k but I wanted to know about lane allocation. If I use a sound card in the very top x1 slot with an x16 video card in PCIe slot 1, will the video card drop to x8 if I use only 1 m.2 in the dimm.2 slot? The manual suggests it would drop to x8 since there are only 16 lanes for the CPU. The first PCIe slot would share bandwidth with the dimm.2. Correct?


GFX card goes off CPU lanes (top 2 x16 slots) the others are chipset lanes (not direct to CPU).
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Hopper64
Level 15

‎04-19-2019 02:21 PM

But the dimm.2 slot goes through the CPU as well. I suspect it will force the PCIe slots 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
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Hopper64
Level 15

‎04-19-2019 02:35 PM

I read this review which suggests 2 m.2 drives in the dimm.2 will decrease the PCIe slot to x8:

*“However, since this board employs a DIMM.2 it is worth noting those are CPU lanes as well so if you populate two M.2 Drives in the DIMM.2 module your main slot will drop to x8.”

So this means one drive will not decrease the PCIe slot to x8? I question whether one drive would.

https://www.bjorn3d.com/2018/11/asus-maximus-xi-extreme-review/3/
**
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
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Menthol
Level 14

‎04-19-2019 05:45 PM

I would guess yes it would, but I am not going to remove one drive from my DIMM.2 module on my Gene to verify
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Hopper64
Level 15

‎04-19-2019 06:36 PM

Aw, come on, take one for the team.*:cool:
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
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