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Possible Bug in Crosshair Vii PCI-E lanes

Nemiel
Level 7
I wondering why my Gigabyte 1080 runs only with 8 Lanes on that Board in the Top Slot.

Testet the NVME in m2_1 and m2_2 slots setting Bios to force GEN3 on the Slots. Reflashing bios to 601 and latest same issue.

My Primary pci-e 16 Slots only works with x8

someone can explain it?


2700x on C7H Wifi with Samsung 960 Pro as NVME Drive and 2 sata drives on Port 1/2
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6 REPLIES 6

enemi74
Level 7
Nemiel wrote:
I wondering why my Gigabyte 1080 runs only with 8 Lanes on that Board in the Top Slot.

Testet the NVME in m2_1 and m2_2 slots setting Bios to force GEN3 on the Slots. Reflashing bios to 601 and latest same issue.

My Primary pci-e 16 Slots only works with x8

someone can explain it?


2700x on C7H Wifi with Samsung 960 Pro as NVME Drive and 2 sata drives on Port 1/2



2 x PCIe 3.0/2.0 x16 (x16 or dual x8) *2

1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)
1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (PCIE 3.0 x 4 mode)
*2 The PCIE_x8/x4_2 slot shares bandwidth with the M.2_2 slot.
you need to use the bottom slot to have the primary PCI-E slot stay at 16x. Using the top M.2 slot drops the main PCI-E to 8x.
https://www.asus.com/us/Motherboards/ROG-CROSSHAIR-VII-HERO/specifications/

as you can read testet both m2 slots and without m2 slot all effekt was top pci-e slot runs with 8 lanes insetad the 16.
Place the 1080 in other board x16 switch bach to c7h x8

Conenubi701
Level 7
Hopefully this gets addressed for you soon. Seems like Elmor is aware of this issue from when he posted the 0804 bios.


I personally don't have this issue and I have my NVME m.2 ssd in the bottom slot.

elmor
Level 10
Can you run this software and provide a screenshot to help me debug it? Thanks!

https://1drv.ms/u/s!Atmpv-6qHr_6n5t_o6XtHdvTAMhuhw

found the error was not a Board bug.

CPU was broken. After RMA it Board works fine.