GPU not detected in top PCIE slot after CPU upgrade

Daaaveee · 29 Dec 2016 at 14:28

I've just picked up a second hand delidded and lapped i7 6700K to replace my i5 6600K, and the wife will get a nice upgrade to that from the i3 6100. However I seem to have a bit of an issue, not sure if its the CPU or motherboard, or something else thats the issue.

I installed the 6700K, it booted up fine but the GPU was not detected. I reseated the 1070, checked all power cables and reset CMOS but it still didn't detect it. Plugged the monitor in to the IGPU and it gave a signal, so I checked the BIOS and it was set to output display to PCIE 1 first so no issues there. I then tried the GPU in the lower PCIE slot (8x speed instead of 16x on my Gigabyte Z170MX), and it detects the GPU fine and is working OK.

It was fine with my 6600K previously so I'm not sure where the issue is. The IHS had slipped during the shipping and was at around a 45 degree angle, so I slowly and gently rotated it back to its correct orientation. Maybe the Liquid Ultra under the IHS has been pushed off the die and has done something? I don't know much about the delidding and die to IHS TIM application procedure, and have not used Liquid Ultra myself.

The motherboard is the Gigabyte Z170MX-Gaming 5 and is running the latest bios. Any help appreciated!

Stelly · 29 Dec 2016 at 14:32

Have you tried disabling the onboard GPU to see if that helps?

Stelly

Stelly · 29 Dec 2016 at 14:39

Hey,

So looking at the manual you can specify which slot the motherboard uses first for the GPU detection its called "Initial Display Output" change this to PCIe slot 1 and then see if this works, if this doesnt work I would look at trying to disable the integrated GPU.

If the above doesnt work you can disable to integrated GPU using the following BIOS setting:

Internal Graphics
Enables or disables the onboard graphics function. (Default: Auto)

I take it that the onboard GPU is working fine... let me know how it goes.

Cheers,

Stelly

Safetytrousers · 29 Dec 2016 at 14:43

If you can't get the GPU to work as is, I wouldn't disable the integrated graphics, because if that is the only graphics working and the GPU still doesn't output a picture you might be left high and dry. Carry on trying to get the GPU detected.

Daaaveee · 29 Dec 2016 at 15:27

Thanks for your help, just tried disabling the onboard GPU but the GPU is still not detected. The initial display output is set to PCIe slot 1 as well.

GPU is back in the lower slot now and working fine. Not ideal but at least its got me up and running.

spolsh · 29 Dec 2016 at 15:45

Try the 6600k in there again, at least you'll know if it's CPU or board that's the problem.

Daaaveee · 29 Dec 2016 at 15:49

spolsh said:
Try the 6600k in there again, at least you'll know if it's CPU or board that's the problem.

It was fine with the 6600K this morning at least.

vapor matt · 29 Dec 2016 at 17:03

try turning 1st pcie slot to 8x see if it outputs a signal then. and other devices using the PCIE bus?

Daaaveee · 29 Dec 2016 at 17:15

vapor matt said:
try turning 1st pcie slot to 8x see if it outputs a signal then. and other devices using the PCIE bus?

Looking through the BIOS there doesn't appear to be an option to do this.

Nothing in else the PCIE slots or M.2 slot.

Thanks for your help

Stelly · 29 Dec 2016 at 18:03

got any mates with a computer you can try the GPU in mate? I would offer to being a computer over if you were not so far away

Stelly

darket · 29 Dec 2016 at 18:35

Its highly unlikely to be the cpu, its going to be cpu socket related.

Its posible that in changing the cpu caused one of the following issues :-

You have bent or disloged a socket pin

Some thermal paste has entered the socket and causing a poor contact

The contact pads on the Cpu are tarnished or dirty through handling

The cooler is over tight.

My advice would be to remove the cpu , inspect the socket for damage, clean the contact pads with some solvent and remount the cooler.

Daaaveee · 29 Dec 2016 at 18:43

Haha thanks Stelly. Tested the GPU in the wife's PC and no issues there. Her 1060 also doesn't work in the top slot either.

I'll try what darket has suggested and report back, it definitely sounds feasible

Daaaveee · 30 Dec 2016 at 16:03

Well I found the problem, I'm a complete idiot, over tightened the CPU cooler and bent the PCB in one corner! I think I was lucky not to damage it further. It seems fine other than the top PCIE slot not working. Hopefully no other issues crop up in the future but I guess it depends what those 4 or so pins are for?

Not sure what I was thinking tightening the cooler so much :confused:

Live and learn I guess!

Here are some photos for your amusement:

HoneyBadger · 30 Dec 2016 at 17:06

Ouch!

Doogles · 30 Dec 2016 at 18:17

Can't you just very slowly bend it back? If you can get it level I wouldn't of thought you'd have damaged it.

pastymuncher · 30 Dec 2016 at 18:45

That looks like it's cracked the pcb to me. What cooler is that because it's unusual to see threaded holes in the bracket these days? Use less thermal paste as thats way too much.

Daaaveee · 30 Dec 2016 at 19:03

I tried to bend it back but it's going to need more force than I'd be comfortable applying to get it straight I think.

The cooler is the Cryorig H7, it has threaded bolts and Philips head screws on the underside, I just tightened them up, not really thinking that they were too tight but obviously they were.

TIM is Thermal Grizzly Kryonaut, just applied using the applicator as thin as I could. Looks a little extra around the edges but temps were great. It's OCd to 4.6ghz no problem with 1.35v for the moment, max temps 70c in realbench with low speed fan profiles.

Zen70 · 30 Dec 2016 at 19:55

Use either a heat gun or a hair dryer and slowly and carefully, heat up the pcb and once it is hot, slowly bend the corner back until it is straight and then let it cool down and it will sit straight and the pads will make contact with the pins in the socket.
Then try your gpu in pcie 1 and hopefully it should all work fine.

Also in regards to applying Kryonaut on your 6700K, for best results, just use the vertical line method, which is just putting a very thin line in the centre of the IHS from the top to the bottom, with the top being, while the corner with the triangle, is in the bottom left hand corner.

Minstadave · 30 Dec 2016 at 20:02

Bend it back, it'll be reet!

darket · 31 Dec 2016 at 02:10

Don't to bend just the corner back it will most certainly break.

Take the lid off , clean off all the clu. Get yourself a g clamp and 2 strips of wood .

heat the chip with a hair dryer and then clamp the chip between the strips of wood along the edge.(avoiding the die and any raised components)

Then leave it overnight.

If you aren't sure about this i'll happily post up some pics.