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XFX 7870 is not detected on PCI-E 3.0 x16

post #1 of 7
Thread Starter 
Hello,

As the title says, I'm having the issue that when I plug my XFX 7870 into the top PCIE x16 slot (PCIEX16_1) I will just get the "No display detected" on my monitor when I start up my computer. If I set up the PCI-E slot in the BIOS to use Gen2 (2.0) instead however, it will work. It also works in the PCIEX16_2 slot, but that one runs at x8.

I've tried posting this on the ASUS ROG forums (as my mobo is a ASUS Maximus VI Hero, and I didn't have the issue on my old mobo as that one only supported PCI-E 2.0 anyway) and the advice I got was to try reseating the CPU. Did that and it didn't help - so figured I'd post here as well incase there's anyone that has experienced similar issues or knows of anything I should try. Thanks!
post #2 of 7
Quote:
Originally Posted by katatoni View Post

Hello,

As the title says, I'm having the issue that when I plug my XFX 7870 into the top PCIE x16 slot (PCIEX16_1) I will just get the "No display detected" on my monitor when I start up my computer. If I set up the PCI-E slot in the BIOS to use Gen2 (2.0) instead however, it will work. It also works in the PCIEX16_2 slot, but that one runs at x8.

I've tried posting this on the ASUS ROG forums (as my mobo is a ASUS Maximus VI Hero, and I didn't have the issue on my old mobo as that one only supported PCI-E 2.0 anyway) and the advice I got was to try reseating the CPU. Did that and it didn't help - so figured I'd post here as well incase there's anyone that has experienced similar issues or knows of anything I should try. Thanks!

Do you get to windows? (meaning you hear the beeps and see HD activity and windows loading) or does it give the 4 beep salute of "No vga inserted?"

If gen 2 didnt work in the first slot, then it would be a hardware problem on the card (that happened to one of my 7970's). But since Gen2 is working and Gen 3 is NOT, (both gen2 and gen3 are pcie x16), that's PURELY a BIOS problem
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post #3 of 7
Thread Starter 
The computer seems to get to windows yes even when I have it set to gen3 in that slot, the Q-led on the mobo atleast shows everything just the same as it does when I have the hard card working using Gen2 or the other PCI-E slot.

Currently I'm using the other one (Gen3 x8) and it works fine, but it's still a rather frustrating issue. I tried flashing BIOS to the latest version as it stated it had some compatibility fixes but it didn't help
post #4 of 7
On your card, look at the bottom where the golden section is. You will see 16 small chips that line up to the pcie slot on the mobo.
If one or more are missing or damaged, it will default to a slower speed (x8).
I just had a Asus 7870 that was running at x8 when my mobo supported x16. Turns out, 2 of this small chips were damaged.
Since there are 16 chips, this is the x16.
post #5 of 7
Thread Starter 
Thanks for the tip, I'll have a look at this when I get home tonight. I have my doubts though as it will run x16 when the port is set up in bios to work as pcie 2.0 rather than 3.0. It's just when it's set to auto/gen3 that I won't get any display at all using that port. The port I've been using it on now doesn't go above x8 so it's not being "downscaled"
post #6 of 7
Thread Starter 
It appears that was indeed not the issue. Thanks anyway for the suggestion though smile.gif
post #7 of 7
I would agree that it's either a BIOS issue or a hardware issue with the mobo itself. Nice thing is that the way hardware is, at least right now, it can barely utilize 8x much less 16x. The difference in performance is very small.

But it would bother me not having my rig working to its full potential so I can understand.
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