Problem with pcie slot

[neurotik]

Hello guys,

I recently buyed a new rig but i encountered a serious problem,

actual build;

i7-6700k

asus viii gene

corsair vengeance lpx (4x4 GB)

and i used some old stuff (budget limitation)

old 700w psu (80+ silver)

and 1 sapphire hd 6870

i installed everything and the pc do just fine but when i installed the gpu the mobo recognize it only if i put it in the 8x slot, not in the 16x one.

so i have the last bios update for mobo and i updated the vbios of the gpu, wednesday i hope  a friend of mine will took his video card here to test it out.

the strange things is that the card fans spins so i don't think it's the card and i was guessing there are maybe some compatibility issues with this new chipset?

or i just got a bad mobo with a faulty pcie slot?

[Domifi]

Which pcie slot did you use?

 

And do you have something else plugged into the pcie or m.2 slots?

Edited February 14, 2016 by Domifi

[neurotik]

if i put the card on the first 1 (the nearest to the cpu) it doesn't get recognized (i look if it's recognized in the bios)

on the second one it get recognized and works but it's an 8x slot

[Domifi]

2 minutes ago, neurotik said:

if i put the card on the first 1 (the nearest to the cpu) it doesn't get recognized (i look if it's recognized in the bios)

on the second one it get recognized and works but it's an 8x slot

That's because the second slot is only a 8x slot electrically. That the top slot isn't working is a concern, do you have a different GPU to test with or a different PC to test the GPU with? If not, it shouldn't be a problem anyways: Your GPU won't be bottlenecked by an PCIE Gen 3.0 8x slot.

[zMeul]

by any chance, with the card in the 1st PCIe do you have video output from the on-board?

if yes, go into BIOS and change 1st video to PEG

 

see page 3-26 of the manual: https://a248.e.akamai.net/f/1828/2290/9f/dlcdnet.asus.com/pub/ASUS/mb/LGA1151/MAXIMUS_VIII_GENE/E10484_MAXIMUS_VIII_GENE_UM_WEB.pdf

[neurotik]

i already tryed that, i enabled dual monitor and connected both the video card and the on board gpu to two different monitor, black on the monitor connected to the gpu

[zMeul]

5 minutes ago, neurotik said:

i already tryed that, i enabled dual monitor and connected both the video card and the on board gpu to two different monitor, black on the monitor connected to the gpu

well ... the issue at hand could be quite complicated since top two PCIe connectors have PCIe lanes directly from the CPU

 

---

 

what you could also try is to change PCIe configuration to PCIe gen 2, the HD6870 is a PCIe gen2.1 card

see manual page 3-27 top

[neurotik]

when i first mounted the cpu i saw a bent pin on the board, i set that in place na dinstalled the cpu and everything was working....it's maybe the problem?, also tryed pcie 2nd gen no luck....i think i need to try another video card and hope not to rma

[zMeul]

23 minutes ago, neurotik said:

when i first mounted the cpu i saw a bent pin on the board, i set that in place na dinstalled the cpu and everything was working....it's maybe the problem?

most likely 

[neurotik]

there is a way i can identify whic pins are connected to the pcie?

[zMeul]

5 minutes ago, neurotik said:

there is a way i can identify whic pins are connected to the pcie?

if you have the tech specks for the 1151 socket, yes .. not sure if they are publicly available tho

[neurotik]

don't you think it's possible that the video card is not compatible with the new lga 1151?

if you have time go take a look at this

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1151/MAXIMUS_VIII_GENE/M8G_Devices_QVL.pdf

[zMeul]

7 hours ago, neurotik said:

don't you think it's possible that the video card is not compatible with the new lga 1151?

the short answer, no

the long one ... no

 

---

 

the LGA1151 tech specs should be here: https://www-ssl.intel.com/content/www/us/en/processors/core/desktop-6th-gen-core-family-datasheet-vol-1.html

but for some reason, I can't download it; possible maintenance on Intel's domain

 

le: nah .. it's not there

Edited February 15, 2016 by zMeul

[neurotik]

hello, sorry for beign late but i maybe found somethings, i installed aida64 and when i check motherboard-chipset-pcie controller i only see 1 controller that says port #2, it maybe means that the controller on port 1 is not recognized?

 

edit:

when i connected the card aida shows the 2 pcie slot...