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[Guru3D]AMD Gives Statement on the PCI-Express Overcurrent Problems - Page 2

post #11 of 40
The reference design appears to be physically wired to draw as much power from the PCIe slot as from the 6-pin connector, so apparently the only way to fix it in the reference design at stock is to cap the card's power at 150w. Possibly by lowering the VRAM speed to 7 Ghz as some are saying, or boost clocks.

The "unprecedented" 8 Ghz memory comment seems to go that way, although it's a bit of an unfortunate comment from them as the GTX 1070 was released before, also has 8 GB of 8 Ghz GDDR5 and also has a 150w board power.

Lowering the voltage, if it works for every card, would make people ask the question why they hadn't done that from the start, so I'm guessing that won't work for every card.

Overclocking a reference design with that kind of fix in place either won't work or it will bring the problem back. The problem being, of course, constantly drawing more than 75w from the PCIe slot. Any additional power required by the card from overclocking should always count on 6 / 8 pins and never on the PCIe slot. It seems that only a revision of the reference design can fully solve the problem. And non reference cards, of course.


Interesting video. Fast forward to min 54:

https://www.twitch.tv/buildzoid/v/75850933


Quote:
Originally Posted by The Stilt View Post

Quote:
Originally Posted by bmgjet View Post

Other version has only 4 chips with the lower clock speed.

So are you saying that there are RX 480 cards with 128-bit memory interface out there?


No. There are cards like the GTX 960 with both a 2 GB and a 4 GB version, also true for the R9 380, and the R9 290X which later in life also came with 8 GB of VRAM. They either put two chips per memory channel instead of one, just like you can do at home when you populate your DDR3 / DDR4 motherboard with one or two dimms per channel or alternatively use chips with twice the capacity.
Edited by tpi2007 - 7/3/16 at 7:22am
 
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post #12 of 40
Quote:
Originally Posted by The Stilt View Post

So are you saying that there are RX 480 cards with 128-bit memory interface out there?

If there were GDDR5 DRAM available with 64-bit IO and they used two CS lines, it could be done that way and retain a 256-bit bus. Since I doubt that is their thought process though, it's probably safer to assume ignorance.
post #13 of 40
Quote:
Originally Posted by tpi2007 View Post

The reference design appears to be physically wired to draw as much power from the PCIe slot as from the 6-pin connector, so apparently the only way to fix it in the reference design at stock is to cap the card's power at 150w. Possibly by lowering the VRAM speed to 7 Ghz as some are saying, or boost clocks.

The "unprecedented" 8 Ghz memory comment seems to go that way, although it's a bit of an unfortunate comment from them as the GTX 1070 was released before, also has 8 GB of 8 Ghz GDDR5 and also has a 150w board power.

Lowering the voltage, if it works for every card, would make people ask the question why they hadn't done that from the start, so I'm guessing that won't work for every card.

Overclocking a reference design with that kind of fix in place either won't work or it will bring the problem back. The problem being, of course, constantly drawing more than 75w from the PCIe slot. Any additional power required by the card from overclocking should always count on 6 / 8 pins and never on the PCIe slot. It seems that only a revision of the reference design can fully solve the problem. And non reference cards, of course.


Interesting video. Fast forward to min 54:

https://www.twitch.tv/buildzoid/v/75850933
No. There are cards like the GTX 960 with both a 2 GB and a 4 GB version, also true for the R9 380, and the R9 290X which later in life also came with 8 GB of VRAM. They just put two chips per memory channel instead of one, just like you can do at home when you populate your DDR3 DDR4 motherboard with one or two dimms per channel.

Luckily the power distribution balance can be altered wink.gif
Working on it and I'll should have further info available after w1zzard from TPU has tested my fix.
post #14 of 40
Quote:
Originally Posted by The Stilt View Post

Luckily the power distribution balance can be altered wink.gif
Working on it and I'll should have further info available after w1zzard from TPU has tested my fix.

It can? That's good news. Can it be done in the drivers like they are saying? Or is it firmware you're working on?
Edited by tpi2007 - 7/3/16 at 7:32am
 
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post #15 of 40
Quote:
Originally Posted by tpi2007 View Post

It can? That's good news. Can it be done in the drivers like they are saying?

It can done through the drivers too, however I'm not sure if AMD has even looked into this method. I've heard that they are looking to reduce the total power draw by other means. It is a VRM controller feature, so I'm not sure AMD is even aware of such possibility. But we'll see.
post #16 of 40
Quote:
Originally Posted by tpi2007 View Post

No. There are cards like the GTX 960 with both a 2 GB and a 4 GB version, also true for the R9 380, and the R9 290X which later in life also came with 8 GB of VRAM. They either put two chips per memory channel instead of one, just like you can do at home when you populate your DDR3 / DDR4 motherboard with one or two dimms per channel or alternatively use chips with twice the capacity.

If we're talking about a 256-bit memory bus with 4/8 chips, that would require DRAM with 64-bit IO. I do not believe GDDR5 is produced in that configuration. If we're talking 8/16, then sure so long as the PCB and memory controller have support for multiple banks or there is an address decoder on the PCB to generate CS signals based on the address. That last solution is unlikely on a modern high-frequency memory system.
post #17 of 40
What will more than likely happen is that they will put out a driver fix for this issue and then funnel as many chips as possible to the AIB partners to build their non-reference cards. In essence this story and issue will be null and void in the next two weeks as those cards start trickle out to the market, nothing to see here.
Edited by 12Cores - 7/3/16 at 9:29am
    
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post #18 of 40
Quote:
Originally Posted by 12Cores View Post

I essence this story and issue will be null and void in the next two as those cards start trickle out to the market, nothing to see here.

Your correct. Nothing to see here because this card will fade into the night.
Smart buyers would wait for the GTX 1060.
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post #19 of 40
Quote:
Originally Posted by PostalTwinkie View Post

I am curious how they plan on addressing this via drivers. They can either attempt to under-volt the cards, and hopefully all the ones out already are fine and run under-volt, or they lower clocks speeds. Either case is going to result in a mess for AMD on some level.

Probably feel its a safer option that having ppl update their firmware and pissibly brick the cards. I could be wrong but I doubt the crimson driver package comes with a firmware updater.
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post #20 of 40
Quote:
Originally Posted by WorldExclusive View Post

Your correct. Nothing to see here because this card will fade into the night.
Smart buyers would wait for the GTX 1060.

Judging from how well the gtx960 did and how well it's held up I'd certainly take mid range nvidia products with a large grain of salt before I'd consider them a smart buyer's purchase.

I do look forward to seeing how the 1060 does, but I expect it to cost more and perform at best on par or slightly worse than than the 480 with it's 'best feature' being lower power consumption. And I mean in it from comparison of AIB's on both sides not reference.
Edited by SoloCamo - 7/3/16 at 8:29am
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