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[Reddit] RX 480 fails PCI-E specification - Page 15  

post #141 of 1129
Quote:
Originally Posted by Defoler View Post

I would like to see a graph of that. Personally in the past I killed 2 motherboard for drawing too much out of the ATX socket (no extra power connections for PCIE on them). They were not cheap, but just not exactly for what they were planned to do.

Prepare to not be amazed!

10-R9-295X2-Power-Consumption-Gaming.png

Only around 30-40w on the PCIE Slot stock. And around 222w per 8pin connector stock.

IIRC they only powered the pumps and the fan from the PCIE slot. Everything else went through the PCIE connectors. Interesting that when this GPU came out they had a list of recommended PSUs and stated that you should never use those split 8pin connectors.
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post #142 of 1129
So will I have a problem being on pcie 2.0?
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post #143 of 1129
Quote:
Originally Posted by prjindigo View Post

Uh... The motherboard connection is good for 96 watts peak with 54 sustained, if you don't have a good power supply to operate the 6-pin, you've got MAJOR issues.

An 8 pin is the same as a 6 pin with 2 more grounding wires, it doesn't supply any more power than a 6. Technically a 6 pin equipped card isn't supposed to use PCIE slot power at all. Each PCIE power cable 12v wire (of which there are ONLY EVER 3 on a connector, whether 6 or 8 pin) can handle 6amps at 12v.
Quote:
EDIT: UPDATE FROM AMD:

1) The RX 480 has passed PCIe compliance testing with PCI-SIG. This is not just our internal testing. I think that should be made very clear. Obviously there are a few GPUs exhibiting anomalous behavior, and we've been in touch with these reviewers for a few days to better understand their test configurations to see how this could be possible.

2) Update #2 maybe the OP is confused. There is a difference between ASIC power, which is what ONLY THE GPU CONSUMES (110W), and total graphics power (TGP), which is what the entire graphics card uses (150W). There has been no change in the spec, so I would ask that incorrect information stop being disseminated as "fact."

We will have more on this topic soon as we investigate, but it's worth reminding people that only a very small number of hundreds of RX 480 reviews worldwide encountered this issue. Clearly that makes it aberrant, rather than the rule, and we're working to get that number down to zero.


Basically it looks like Tomshardware is using a damaged testing rig, the 80w draw on the PCIE cable is laughable... that's a single 12v wire on the 6pin's capability. It looks like they have a damaged supply or molex.

I'd place my bets on it being MSi having broken rules. Again.

Yeah, that's not right at all. AMD responded real quick about it though. Very prompt.
post #144 of 1129
Quote:
Originally Posted by andydabeast View Post

So will I have a problem being on pcie 2.0?
iirc yes. becasue pci-e 2.0 allows only for 75 wats power draw from slot. pci-e 3.0 iirc is allowing for 150w? i dont know how this pci-e "gate" is a problem. company that stands behind pci-e standard FOR 100% tested rx 480 and aproved. rolleyes.gif
Edited by prznar1 - 6/30/16 at 7:17am
post #145 of 1129
Quote:
Originally Posted by Alex132 View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by Defoler View Post

I would like to see a graph of that. Personally in the past I killed 2 motherboard for drawing too much out of the ATX socket (no extra power connections for PCIE on them). They were not cheap, but just not exactly for what they were planned to do.

Prepare to not be amazed!

10-R9-295X2-Power-Consumption-Gaming.png

Only around 30-40w on the PCIE Slot stock. And around 222w per 8pin connector stock.

IIRC they only powered the pumps and the fan from the PCIE slot. Everything else went through the PCIE connectors.
Interesting that when this GPU came out they had a list of recommended PSUs and stated that you should never use those split 8pin connectors.



I was just looking for that. Here it is:

Quote:
Originally Posted by PsyM4n View Post

Warning: Spoiler! (Click to show)
Before grabbing and putting one of those cards in your system it's very important to be aware of the following:

The R9 295x2 does not confront to the PCI Express 3.0 power delivery specifications.

According to the Peripheral Component Interconnect Special Interest Group the said specifications specify a power draw of 150 watts from each 8-pin PCIe power connector, 75 watts from each 6-pin PCIe power connector and 75 watts from the PCIe slot.

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.

For validation and more information on the related specifications you can visit the PCI-SIG website (http://www.pcisig.com/).

-

What does this mean for me?

It means that the R9 295x2 can overload the cables on your power supply, resulting in cables melting and a possible fire hazard.

-
What can I do about this?

AMD is fully aware of this situation and plans to setup a list of compatible power supplies. Whenever the list becomes available AMD plans to put it on the following web address:

http://www.amd.com/r9

Some of the R9 295x2 reviewers were also informed about the situation with the following note:



The best things you can do are to consult the power supply compatibility list AMD has (whenever it becomes available) and to specifically ask your power supply maker to tell you if the power supply is compatible with the R9 295x2.

-

Spread the word and inform yourself and the ones affected. It's better to spend some time with customer support than to kill hardware that costs thousands!

Be reasonable people.



All in all the issue here is that while the R9 295X2 didn't exceed the PCIe slot spec and when it came to the 8-pin connectors it made clear what its requirements were, at the end of the day it wasn't a PCIe compliant device and therefore not included on the Systems Integrator List because of this, so people knew what they were getting into.

The RX 480 is a mainstream card that is likely to go into many OEM systems, the implications are completely different.

I'd like to ask the people who are trying to downplay the issue if they'd be fine if a GTX 750 Ti without a power connector would pull 90w from the slot instead of its rated 60w. All of that talk about the card being great to upgrade crappy OEM systems with an otherwise decent Intel CPU but only integrated graphics would go down the drain. Nobody would recommend people risk damaging the system with an out of spec card. The 750 Ti is such a great card because it does what it says.

And again, the reference GTX 970 comes with two six pin power connectors and has a 145w max board power. The RX 480 has a 150w rating and only has one. AMD was even boasting about it (see below). Considering the measurements made by the majority of sites, not even counting the ones that specifically measured the PCIe slot demands, it seems pretty clear that the card uses more than 150w very frequently. It's inadequate and misleading to think it's a 150w card.

 
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post #146 of 1129
Tech something or other reviewed this card and said it was over to (maybe you posted it didnt see)

Also we play games for like 15+ hours a day with our pcs on 24/7 how is this not an issue? wake up in the middle of the night and your house is on fire then it will be an issue biggrin.gif
post #147 of 1129
Those tests were only done on higher quality boards, might it be possible that the card only uses 75W+ because the mainboard allowed to do so?
post #148 of 1129
Quote:
Originally Posted by HackHeaven View Post

Tech something or other reviewed this card and said it was over to (maybe you posted it didnt see)

Also we play games for like 15+ hours a day with our pcs on 24/7 how is this not an issue? wake up in the middle of the night and your house is on fire then it will be an issue biggrin.gif

15+ hours a day? lol ok.

Anyway unless you are gaming on it while you are asleep I'm not sure how you would wake up to the house being on fire.

Not trying to downplay the issue just your post doesn't make sense. It seems very weird not to just use two 6 pin connectors for this card
post #149 of 1129
oh noes!

better have that class action lawsuit ready.
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post #150 of 1129
Quote:
Originally Posted by Waitng4realGPU View Post

15+ hours a day? lol ok.

Anyway unless you are gaming on it while you are asleep I'm not sure how you would wake up to the house being on fire.

Not trying to downplay the issue just your post doesn't make sense. It seems very weird not to just use two 6 pin connectors for this card

Ok maybe not *we* but i dont have a job so im either on my pc or sleeping because i dont go outside either lol

I am most of the time gaming or have a game on in the background while doing other stuff on the web (like right now i have a game open while typing this)

I stream sometimes while gaming and its over 10 hours most of the time so 15+ hours seems about right or maybe lower
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