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Z87X-UD3H 2nd Video card not registering.

Last response: in Graphics & Displays
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March 10, 2014 9:06:40 PM

I'm about to lose my mind over this. I have a machine I built summer of 2013 which originally included one GTX 780. I recently purchased a second card (exact part number), and inserted it in the 8x PCI-E slot (the original card being in the 16x slot). The new card did not register at all aside from the fan spinning up and the cards lights working (it did not show up in device manager / nvidia control panel, etc). I then removed the original card, put the new card in the 16x slot and everything worked fine on its own so the new card wasn't defective or anything. But when I connected the old card back into the 8x slot the now the old card was not recognized. No matter what I did, the second card would not register when both were connected, this is with and without the bridge.

I was under the impression that if there is no card in the 16x slot then a single card should work in the 8x slot - so I gave this a shot. Neither card would give me video when used independently out of the 8x slot except for 1 -2 times, which led me to believe that there was an issue with the 8x slot (I temporarily though it might have been a seating issue although everything seemed to indicate otherwise, but just to be safe I used an old invidia card with no clearance issues and when seated perfectly still no video out). I tried the usual driver wiping and reinstalling, updated the BIOS version to F8, etc etc. Multiple people told me I probably had a faulty motherboard so rather than wait for an RMA, I just bought a new Z87x-UD3H and tried again. Same exact issue. Something I had originally overlooked was connecting power to the ATX4P connector on the board, still no change.

So in summary, I have 2 GTX 780s that when both connected will not register the card on the 8x slot regardless of which card is in which slot. The problem is persistent on two different Z87X-UD3H motherboards. Does anyone have any ideas that may help before I toss myself over a bridge?

More about : z87x ud3h 2nd video card registering

March 10, 2014 9:21:37 PM

Already said above, but yep, tried that to no avail =/
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a b U Graphics card
March 10, 2014 9:23:16 PM

What is your PSU model?
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a b U Graphics card
March 10, 2014 10:03:57 PM

I'm assume that you also make sure every power plug especially ATX, CPU, and both PCI-E were secure and tight?
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March 10, 2014 10:07:54 PM

IDontUnderstand said:
I'm assume that you also make sure every power plug especially ATX, CPU, and both PCI-E were secure and tight?


yes sir
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a b U Graphics card
March 10, 2014 11:24:53 PM

Is it detected in BIOS?
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March 11, 2014 6:30:46 AM

As far as I can tell this bios doesn't list connected gpus, so I can't tell if the bios actually sees it
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a b U Graphics card
March 11, 2014 11:51:32 AM

Another thread that talks about it, just so you know you aren't the only one lol
http://www.tomshardware.com/answers/id-1714412/problem-...

I would try putting both cards into the board and SLI bridge, then just clean install the latest driver again.

Make sure it's uninstalled in Windows > cleaned up by driver sweeper or driver fusion in safe mode > restart > install the latest.
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March 11, 2014 11:20:09 PM

Thanks but after trying your recommendations and following the link and following theirs, still no dice.
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a b U Graphics card
March 11, 2014 11:23:23 PM

Sorry that I was unable to help and I'm kind of out of ideas, so I can only recommend calling Gigabyte and see if they got anything or buying another board as a solution.

Good luck.
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a b U Graphics card
March 11, 2014 11:40:00 PM

Perhaps the second x8 PCI slot is defective.
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March 12, 2014 9:49:26 PM

terry4536 said:
Perhaps the second x8 PCI slot is defective.


On two consecutive boards?

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a b U Graphics card
March 13, 2014 2:39:49 AM

I just put a generic high end desktop pc with 8GB of RAM, one HDD, one DVD, AND TWO GTX 780s into the Newegg PSU calculator. Guess what the recommended PSU was? 912 Watts

Your 850watt PSU is your problem.
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March 13, 2014 7:15:37 AM

terry4536 said:
I just put a generic high end desktop pc with 8GB of RAM, one HDD, one DVD, AND TWO GTX 780s into the Newegg PSU calculator. Guess what the recommended PSU was? 912 Watts

Your 850watt PSU is your problem.


I have 3 different video cards, all of which work in the 16x slot. None of which work in the 8x slot (even when they are the only card being used) - that is clearly not a power issue.
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a b U Graphics card
March 13, 2014 10:32:55 AM

That PSU will be able to at least boot up the system and run games without any problem, unless it's defected.
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a b U Graphics card
March 13, 2014 7:15:20 PM

So tell me, where are the extra watts coming from if not from your PSU?

"I recently purchased a second card (exact part number), and inserted it in the 8x PCI-E slot (the original card being in the 16x slot). The new card did not register at all aside from the fan spinning up and the cards lights working (it did not show up in device manager / nvidia control panel, etc). " The PSU WAS able to power up the fan and lights on the second card just not the whole card. There is no more mystery than that.
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March 13, 2014 11:37:58 PM

terry4536 said:
So tell me, where are the extra watts coming from if not from your PSU?

"I recently purchased a second card (exact part number), and inserted it in the 8x PCI-E slot (the original card being in the 16x slot). The new card did not register at all aside from the fan spinning up and the cards lights working (it did not show up in device manager / nvidia control panel, etc). " The PSU WAS able to power up the fan and lights on the second card just not the whole card. There is no more mystery than that.


Ok, so you're telling me if I remove the 2nd card, and the SINGLE card works perfectly fine in slot one, but doesn't work in slot two - it's a power issue. Riiiiiiiight. I know it's convenient to say it's a power issue, but I can remove the 2nd card and the board is still having the issue of NOTHING recognizing out of that second slot.
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a b U Graphics card
March 13, 2014 11:50:09 PM

You already said that you didn't believe that it was a defective slot. And from your title, we are talking about getting two GTX 780 cards to work.

I'm not here to argue with you. If you don't want help just say so, I've got better things to do.
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March 14, 2014 10:13:55 AM

terry4536 said:
You already said that you didn't believe that it was a defective slot. And from your title, we are talking about getting two GTX 780 cards to work.

I'm not here to argue with you. If you don't want help just say so, I've got better things to do.


Sorry man, I'm not trying to be standoffish about this. But by the time I reply to these messages at night I'm just about ready to beat a hole in my wall. Anyways...

I was scouring forums last night and I found a very interesting post that is nearly identical to my issue. So this guy:


•Had no cards working / detected in the second slot, but they all worked in the first slot.
•He suspected PSU (He's running 1250W) / Seating issues just like me
•He swapped his mobo for an exact copy / updated bios with no change
•Literally could come up with no explanation


The funny thing is it sounded like his system was running fine and then he bought a new case (Fractal Define R2 XL) and then the issue started happening. Well guess what case I have? Exact same. I'm curious if there is something particular to the case that is shorting the board or something.

It seems like people never follow up their forum posts when they have an issue because I don't know what ended up happening with this guy.

His post is here:
http://rog.asus.com/forum/archive/index.php/t-42245.htm...
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March 14, 2014 11:35:38 AM

I actually was able to get an email back from the guy in question, this is his response:

"It ended up being a problem with my new Fractal case. Basically, the metal part that you screw the video card to on the case was too high up away from the motherboard - which made it impossible for the video card to be properly seated.

What I ended up doing is unscrewing the bottom 3-4 screws on the motherboard and pushing it up toward the video card as much as I could. Sure enough after I did that, the card was recognized and runs perfectly. There is no need to actually put the screws back into the motherboard so that's all it took."

So, his explanation was a little off (screwing the video card onto the case) but I think he's just talking about standoffs. So i'll be playing with that tonight to see if I can finally clear this up.
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a b U Graphics card
March 14, 2014 11:50:42 AM

Interesting, tell me how it goes afterward. I would like to learn.
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March 14, 2014 11:51:53 AM

IDontUnderstand said:
Interesting, tell me how it goes afterward. I would like to learn.


Definitely will!
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March 14, 2014 3:50:08 PM

terry4536 said:
It is a possibility that the case was deformed in shipping for example. Here is the physical dimensions of the pci expansion slots.

http://www.math.uni.wroc.pl/~p-wyk4/so/pci23.pdf
Page 156 -158


Very possible, but considering someone elses exact case has the same issue in the exact same spot leads me to believe its a design flaw. Either way I think i'll try throwing some small rubber washers around the standoffs so that it spaces them up just a tad.
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Best solution

March 16, 2014 6:05:20 PM

IDontUnderstand said:
Interesting, tell me how it goes afterward. I would like to learn.


Issue resolved, it was in fact the case (Fractal R2 XL) the pcie mount for the 2nd slot must have been just slightly too high because i needed to stick a rubber grommet below the mother board to push it up enough to fully seat it. Working perfect now.
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