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Reports of RX 480 damaging PCI-E slots  

post #1 of 139
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I ran into a problem after upgrading my rig with an RX 480 today. Everything was working great but then after a 7-hour straight gaming session with Witcher 3 Blood and Wine (which by the way is AMAZING) I got artifacting and then everything went black and the sound cut out. I reboot my PC several times, but nothing would come up. After looking up the error code on the motherboard, I found that it was "No VGA present" so at first I thought the card was dead and I put back in my 750 ti, but it too would not work with the same error code. So I put the RX 480 in the second PCI-E slot and now everything is working just fine. After everything was A-OK I tried slot 1 again and it failed again, so now I'm in slot 2. I did a Google search to see about this problem and I found several articles about the RX 480 overdrawing power on the PCI-E slot. HOWEVER, I'm not sure I'm ready to pin this issue on that yet, hence why I'm posting. I feel like having the card for just a day and only having a 7-hour gaming session is too soon to cause failure. What do you guys think? Maybe it's just a coincidence? I'm no expert on power draw or what overdrawing would actually do to a slot or even the motherboard as a whole. I also feel like if it was due to overdrawing of power that the whole south-bridge would get messed up and then the second PCI-E slot wouldn't work either, but it does work. I could be wrong in thinking that, though. Anyway, thoughts?

Quote:
I have this exact same issue, totally killed my 990FX from MSI. The issue is that it destroyed all 3 of my x16 slots, and I have nothing to test my other slots. I think the cpu still works, but in all honesty, without any video out I have no idea.

Quote:
Another motherboard has been destroyd by the stuff amd has created. Thanks for this. You will hear soon of me and my lawyer.
Cheers.

Quote:
AMD...R9 380 didn't work at all (lost of signal in many games), RX 480 killing motherboards...


SOURCE

Not looking good for AMD right now. I'm sure we'll see more reports develop on other forums!
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post #2 of 139
A buddy of mine bought a 480 yesterday and shortly after that another friend's motherboard died. Coincidence? I think not. For every 480 sold, a motherboard must be sacrificed somewhere in the world.
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post #3 of 139
A lot of trolling can happen, I really desire that we have some distinguishable proof to evaluate these claims.
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post #4 of 139
Haven't heard of R9 295x2 owners having issues regarding the PCIe slot, and I am sure that card especially when overclock pulls 500w easy.

The R9 295x2 is powered from two 8-pin PCIe power connectors and the PCIe slot. The maximum specified power draw from these adds up to 375 watts. According to AMD, the R9 295x2 can draw up to 500 watts on some typical scenarios and can even peak to about 600 watts

In other words the whole RX 480 PCIe violation is all FUD
Edited by Redeemer - 7/1/16 at 3:34pm
post #5 of 139
Nothing about 960s killing them either.
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post #6 of 139
Wow, it seems like nothing can go right for AMD these days. When they had the best launch ever in terms of sales there are now allegations of them breaking motherboards.
Quote:
Originally Posted by Redeemer View Post

Haven't heard of R9 295x2 owners having issues regarding the PCIe slot, and I am sure that card especially when overclock pulls 500w easy.

The R9 295X2 draws most of its power through the auxiliary 8 pins. Due to how the 480's power phases are connected, the card will begin to draw extra current through the PCIE slot rather than from the PSU directly when it needs extra power.
Edited by NuclearPeace - 7/1/16 at 3:34pm
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post #7 of 139
Unless motherboards have gotten a lot cheaper in build quality, I dont think this could really be true. 10 watts more power draw at most if the reports are to be believed will not kill a MB. Not only have I run boards I set to be able to draw 90w from the slots and never had an issue, the motherboards are also rated for 75w flowing to every PCI-E slot and they many times pull from the same board traces. So those traces are rated for well over 75w, often even over 150w for boards that have more than 2 PCI-E slots. No way to overload the stuff with a card drawing an extra 10 watts, it just isnt possible.
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post #8 of 139
Quote:
Originally Posted by SpeedyVT View Post

A lot of trolling can happen, I really desire that we have some distinguishable proof to evaluate these claims.

The photos were attached by original poster later.

If you pay attention you may even notice the sign of literal burn on motherboard.
post #9 of 139
So how is drawing more power from the PSU any different than the PCIe slot? 8 pins have their power output rating as well, so if a GPU can draw more power from the PSU whats wrong with it drawing more from the PCIe??
post #10 of 139
Quote:
Originally Posted by Redeemer View Post

So how is drawing more power from the PSU any different than the PCIe slot? 8 pins have their power output rating as well, so if a GPU can draw more power from the PSU whats wrong with it drawing more from the PCIe??

Good explanation from the source.
Quote:
Lol, NO.

You are parroting that wrong post someone made on AMD forums.

PCIe eletromechanical specs:

16x, FULL HEIGHT card (half-height the limit is smaller, less than 16x is smaller too).

1. PCI-e slot can have TOTAL of 75W
2. The 12v pins of the slot can have at 12v in total 66W, the limit is actually in amperage (5.5A), meaning if you have vdrop, the W limit lowers too. For example, during the test of a Brazillian reviewer, the 12v dropped to 11.4V, this results in your limit being now 62W.
3. The ATX PCI-E cables must use 12V wires.
4. The PCI-E cables are 6 pin, or 8 pin, the 6pin has a limit of 6.25A, and 8pin limit of 12.5A (thus again, if you have vdrop, your W limit lowers!)
5. Allowed PCI-E cables: 1x6, 1x8, 6+6, 6+8. 8+8 cards exists, but is out of spec, anything beyond that is way out of spec.

Thus the biggest card you can make regarding 12V power (that is what GPU cards tend to draw) is 5.5A for the slot, 18.75A for 8+6 pin ATX cable.
If you have zero voltage drop, this mean the power limit is 291W, IF the GPU has 8pin and 6pin cable. (it is where people are pulling the "300W" limit from)
If you voltage dropped for example to 11.2V (common with cheaper PSUs), the limit is 271W, and if you are a overclocker and overvolt to 12.8V for example, then your power limit is 310W

The RX480 is a single 6-pin GPU, its limits according to the specs are 5.5A (12V) from the slot, and 6.25A from the PSU.

At zero voltage drop (pure 12v), this means it should pull at most 66W from the slot, and 75W from the PSU.
At voltage drop of 11.4v for example, that is what a reviewer saw using a MSI Overclocker motherboard + AX1500i Corsair PSU, the limits are: 62.7W from the slot, and 71.25W from the PSU.

Mind you, what damages the motherboard, pins, connectors, wires, etc... is the amperage, not the raw amount of watts, people that actually used amperage measurement saw the RX 480 with stock settings going 30, 40% over the limit on average (not peak) use. This is outright dangerous, lower quality components might actually caught fire.
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