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Sapphire 7870xt Works in 1 PC but no others

post #1 of 10
Thread Starter 
Alright guys, I have a ridiculously curious issue that I can't nail down.

A few months ago I replaced my Sapphire 7870XT with a 7970. The 7870 was running just fine, but I got a good deal on the new one and couldn't pass it up. Sat the 7870 aside, installed the new one, and enjoyed.

Fast forward a couple of months, I'm building a backup rig and slap the 7870xt in. It simply won't boot. No post, all fans work, etc. So I assume the card is bad. Just to test, I place it back in my computer and it fires right up! I assume the motherboard on the secondary rig is bad and replace it with a completely different brand. Put the 7870xt in that one, Nothing. Same issue. Won't boot. So thinking it can't be 2 bad boards, I put my 7970 in the secondary rig with the new motherboard and it boots. Curious, I put the motherboard in that I replaced and install the 7970 with that one and it also boots! So both motherboards were good. I stress tested the 7870xt on my main rig and it works absolutely fine.

So, I order a new motherboard for my new rig since I wanted to upgrade, get it in, pull the existing one from my new rig, put it in the secondary rig, and grab the 7870. So just to summerize, the motherboard that the card worked on is now in my secondary rig. The brand new, upgraded, motherboard is in my main rig. I put the 7870 in my secondary with the board it worked with - No boot again. I put it in my main rig that has the brand new, untested motherboard - Works perfectly.

Since then I have tried 3 other computers with different setups. NONE of them will boot with the 7870. But my main PC, that I'm typing this on right now, it will work in with any configuration. So just...what in the heck is going on? It's passing all of it's stress tests. No artifacts. No issues. Nothing. It's great. Holding OCs and everything, even stock settings, higher voltages, etc. I have NO idea what is going on with this guy.

Any input?
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The Newbie
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post #2 of 10
Thread Starter 
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The Newbie
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The Newbie
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post #3 of 10
In bios, see if u can find a setting for pcie linkspeed. If its set to Auto or Gen3, try a lower Gen2 setting with the 7870XT
post #4 of 10
Maybe try updating the BIOSes of the motherboards in which it's not working too.
post #5 of 10
What are the motherboards it's not working in?

I've seen workstations pc's that have a PCI-e 16x physical slot, but it's only electrically 8x - meaning it can't supply the full 75 watts via PCI-e.

Like Gumbi suggested if it's an older motherboard, it might require a bios update.
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post #6 of 10
Quote:
Originally Posted by XiKeiyaZI View Post

Alright guys, I have a ridiculously curious issue that I can't nail down.

A few months ago I replaced my Sapphire 7870XT with a 7970. The 7870 was running just fine, but I got a good deal on the new one and couldn't pass it up. Sat the 7870 aside, installed the new one, and enjoyed.

Fast forward a couple of months, I'm building a backup rig and slap the 7870xt in. It simply won't boot. No post, all fans work, etc. So I assume the card is bad. Just to test, I place it back in my computer and it fires right up! I assume the motherboard on the secondary rig is bad and replace it with a completely different brand. Put the 7870xt in that one, Nothing. Same issue. Won't boot. So thinking it can't be 2 bad boards, I put my 7970 in the secondary rig with the new motherboard and it boots. Curious, I put the motherboard in that I replaced and install the 7970 with that one and it also boots! So both motherboards were good. I stress tested the 7870xt on my main rig and it works absolutely fine.

So, I order a new motherboard for my new rig since I wanted to upgrade, get it in, pull the existing one from my new rig, put it in the secondary rig, and grab the 7870. So just to summerize, the motherboard that the card worked on is now in my secondary rig. The brand new, upgraded, motherboard is in my main rig. I put the 7870 in my secondary with the board it worked with - No boot again. I put it in my main rig that has the brand new, untested motherboard - Works perfectly.

Since then I have tried 3 other computers with different setups. NONE of them will boot with the 7870. But my main PC, that I'm typing this on right now, it will work in with any configuration. So just...what in the heck is going on? It's passing all of it's stress tests. No artifacts. No issues. Nothing. It's great. Holding OCs and everything, even stock settings, higher voltages, etc. I have NO idea what is going on with this guy.

Any input?
After re-reading I noticed I missed this part (bolded). So same board that worked with 7870XT, now no longer works - what changed, PSU?
post #7 of 10
Quote:
Originally Posted by BinaryDemon View Post

What are the motherboards it's not working in?

I've seen workstations pc's that have a PCI-e 16x physical slot, but it's only electrically 8x - meaning it can't supply the full 75 watts via PCI-e.

Like Gumbi suggested if it's an older motherboard, it might require a bios update.

Not true at all. PCI-e provides all of it's power through the first few pins before the bus starts. The x8 or x16 is strictly for bandwith purposes. That's why bitcoin mining is able to put a full load on a GPU on PCI-e x1.

To the OP, Sounds to me like either bad seats or dirty contacts. Try cleaning the PCI-e contacts with a lint-free cloth and some 99% isopropyly alcohol and see if that helps. And make sure your seats are good, and all power cables and what not are plugged in.(couldn't tell you how many times I've forgotten that)
Edited by Craiga35 - 10/21/15 at 7:45am
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post #8 of 10
7870 XT has a UEFI bios, correct? Make sure that the motherboard you are trying to use it in supports UEFI otherwise it may just have a blackscreen at boot/no picture.
post #9 of 10
I have to second the notion of checking the PSU - that seems to be the only denominator which will have changed. Especially since it no longer boots on a board it previously worked on.
post #10 of 10
Quote:
Originally Posted by Craiga35 View Post

Not true at all. PCI-e provides all of it's power through the first few pins before the bus starts. The x8 or x16 is strictly for bandwith purposes. That's why bitcoin mining is able to put a full load on a GPU on PCI-e x1.

The motherboard manufacturer determines how much power each PCI-e slots gets. The x1 slots might not be configured to receive the maximum 75w, which is why miners might need a powered (usually by 4pin molex) x1 to x16 adapter. Some older workstations cheaped out with x8 (25w max) slots. Anyway it was a long shot, probably not the issue the OP is encountering.
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