PCI-E runs at x8 instead of x16

[.fess]

Is the card fully seated, is your case not allowing the card to seat fully (test system outside of case similar to how the store tested)
what power supply? is it single rail? multi rail? if multi rail make sure there is nothing else that uses the same voltage rail as the video card

I have no issue on my X Hero, any bios with 1080 in slot 1 &X16

Yeah, i might have to try that again. I have EVGA 850 P2 power supply.

I had a 1080 before and had no issues with it at all. It's the Ti that's giving me grief not just on Maximus X Hero, but on the 4-year old z87-k platform as well.

[.fess]

SOLVED! After all said and done, turns out the issue was with the motherboard itself. After exchanging the mobo for an idnetical one, the problem went away and GPU runs at pci-e 3.0 x 16 with everything plugged in, including two M.2 drives.

Thank you everyone for your help.

[F-ZERO]

I have still the same problem. Tested several GPUs and all shows x8 on this board (All are working at x16 with an GA-Z97x-Gaming 7 from Gigabyte). CPU is an Intel Core i7 7820x. I have updated the BIOS from 0503 to the (at this time) actual version 0802. I have then sent the board to ASUS and they send it back after a month without solving my problem. I have also reassembled my components but the GPU is still at x8. They didn't replaced the board but updated it to version 1004. They even took the original box away and all the additional equipment was stuffed in the same package as the mainboard when it arrived here. That was unexpected and I still want the original box back. ASUS didn't answered my questions since then, taking the original box and just sending my board back without any explanation.

Thanks for your help.

[Bill@ROG]

I have still the same problem. Tested several GPUs and all shows x8 on this board (All are working at x16 with an GA-Z97x-Gaming 7 from Gigabyte). CPU is an Intel Core i7 7820x. I have updated the BIOS from 0503 to the (at this time) actual version 0802. I have then sent the board to ASUS and they send it back after a month without solving my problem. I have also reassembled my components but the GPU is still at x8. They didn't replaced the board but updated it to version 1004. They even took the original box away and all the additional equipment was stuffed in the same package as the mainboard when it arrived here. That was unexpected and I still want the original box back. ASUS didn't answered my questions since then, taking the original box and just sending my board back without any explanation.

Thanks for your help.

Hello
Can you please send me a PM with any of the following details that you do have available?

Product S/N:
Case ID#:
RMA#:

Also please pass me your contact details:
Full name:
Phone#:
Email:

I'll pass your case to related personnel and department for further investigation
Thank you

[Wheity]

@f-Zero

Any hints, why you don't fill out an Support Formular or call Asus Germany, while you post here in a non german Forum?

Please call our line or fill out on our page the Support Formular. If You have this RMA Number: RMA#: 352944022 This ist not an Asus RMA number.

Give us also the hint, to which mail addy you have written to our rma. Maybe You have send in your device over your dealer and not over us.

The right rma address is: op_rma@asus.com

[paulmarc]

Granted, it's a different motherboard, but nearly the same family:

try reseating the GPU.

This made it work for me...

[bass junkie xl]

had this same pci x 8 x issue on my asus rog x hero z 370 it didnt do it when i first got it but then the bios under gpu post didnt even show the gpu was installed and inside windows only gave my 8x under load ... resetting didnt do anything .

then i thought maybee its the pcix riser cable i am using on my vertical 1080 ti in my thermal take view 71 glass case is acting up .

replaced riser cable for the vertical gpu and no issue now

[schweigert]

Currently having the same problem with an Asus Crosshair VII and RX480 - plugging the card directly into the board (or using an extension cable) still only getting 8x - as the only pcie card pugged in (into the 16x/8x slot)

as for throttling the card when not in use, it does go down to pcie 8x - 1.1 - but then jumps up to pcie 8x 3.0 when under load.

[dyni00]

i have this same problem ASUS Z370 GAMING-F and palit gtx 1080 gamerock premium ed.

i have x8 pcie on graphic card and no other devices on pcie. wtf? new bios on mobo (1406 ) but previous (1002 ) not works at x16 too

[bojerka]

I had same problem with ASUS Z87-DELUXE after deliding CPU (4790K). My GPU then running only on x8. Any GPU run on that mobo only x8.
I checked CPU socket if I damaged some pins but all looks OK. I check too PCIe slot but too looks clean and no damage.
Now this mobo with this CPU have my friend (GTX 1080 installed some GIGABYTE) and too runnig only on x8. Idle or full load still x8.