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[Reddit] RX 480 fails PCI-E specification - Page 52  

post #511 of 1129
Quote:
Originally Posted by magnek View Post

Fury X was pretty much a double 280X, and TPU show it's anywhere from 1.7-1.9x better than 280X depending on resolution. Close but still not quite 1:1 scaling. And this is with GCN 1.0 to GCN 1.2 improvements mind you.

So like I said, if Vega is basically a double P10 chip, we can expect somewhere around stock 1080 performance, give or take 10%. Which means a Vega chip with 4096 shaders would likely fall short of 1080 performance.

Vega is IP9, so it should be different than Polaris 10 and could probably do both - bellow and above 1080
Edited by C2H5OH - 7/1/16 at 4:24pm
post #512 of 1129
Quote:
Originally Posted by Mahigan View Post

Oh... custom boards will be perfect. Once they start hitting reviews I think that everyone will forget the shortcomings from the reference board (aside from higher relative power usage to Pascal).

thumb.gif Yes, I realized that the moment I wrote it. 6+6 or 6+8 will provide enough power for the gpu and there will be no need to draw from the PCIe smile.gif
...will see what the efficiency turns out to be with better cooler but you're right - higher power usage relative to Pascal.
post #513 of 1129
Ryan at PCper tested Asus 960 Strix, as there have been rumors for GTX960 having spikes above PCIe specs.
https://www.pcper.com/reviews/Graphics-Cards/Power-Consumption-Concerns-Radeon-RX-480/Evaluating-ASUS-GTX-960-Strix
The card is well within the PCIe specs and exceeds only the technical limits of the 6pin but nothing too dangerous...
Quote:
I decided it crank things up slightly by adding in the maximum voltage increase to the card through Precision X software and then setting the GPU clock offset to +93 MHz.The resulting total power increases to over 115 watts, while the motherboard power increases to nearly 35 watts and the 6-pin power cable jumps to peaking at almost 85 watts.......Again, it is worth noting that the 6-pin power connection is definitely drawing more than the 75 watts that it is technically rated at, but that the motherboard +12V power delivery is still well within the defined 66 watt limit we discussed earlier
post #514 of 1129
Just finished posting my benchmarks for the Sapphire RX 480 8GB and also addressed (sort of) the PCI-E power draw issue. Check it out: http://www.overclock.net/t/1604690/rx-480-unboxing-and-initial-review
post #515 of 1129
Thread Starter 
Quote:
Originally Posted by bmgjet View Post

I find it funny how this is a major issue only because its a card from AMD.
Never saw any one making a major issue out of the 960 with its 100W from the PCI-E
Or the power connector-less 750ti which pulled 120W from PCI-E

That's because the 960 Strix pulled the extra power from the 6-pin PEG and not the PCIe slot. Those big fat wires and connectors can better handle the current than the tiny pins on the PCIe slot.

http://www.pcper.com/reviews/Graphics-Cards/Power-Consumption-Concerns-Radeon-RX-480/Evaluating-ASUS-GTX-960-Strix
Quote:
Just as another data point, here is some captured power delivery with Rise of the Tomb Raider with the GTX 960 Strix card in its overclocked state. Total power draw doesn't exceed 105 watts and the power through that PCI Express slot on the motherboard stays at 30 watts or less.

With our ability to measure voltage and current, we return back to Metro: Last Light at 4K to find that amperage draw over the motherboard's +12V line stays right at 2.5A. That is a drastic difference compared to the RX 480 hitting more than 7A over the same line, especially considering the 5.5A limit from the PCI Express specification.


As far as the GTX 750Ti, I think you are mistaken.

https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_750_Ti/23.html
Quote:
During gaming, typical power consumption is well below the 75 W provided by the PCI-Express slot, an additional PCI-Express power connector is not installed on the card as it is clearly not needed.

The charts show only a max load of 52, 57, and 66 watts total on three games tested, so I don't know where you are getting your numbers from.


http://cryptomining-blog.com/tag/geforce-gtx-750-ti-power-usage/

That link shows the 750Ti, even overclocked, is well below 66 watts.
Edited by ProclusLycaeus - 7/1/16 at 5:27pm
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post #516 of 1129
http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

Looks like it was all made up folks.

Those guys over on the AMD forums were in fact dabbling in astro-turfing. It really is only when you overclock the RX 480 that it can pull up to 90W from the PCIe slot. When you do not overclock it... you are looking at around 73W.

I question the timing of this news after RX 480s began selling like hot cakes and nVIDIA having no response. nVIDIA also "leaked" a picture of a GTX 1060 as a means of getting buyers to hold off as well as claimed "performance" figures with exaggerated graphs.

Sounds very very dubious but I am not surprised. We are talking about nVIDIA here.

As for AMD... I will say it again... 32 ROPs??? Common... seriously. Polaris should have been equipped with 64 ROPs. There also appears to be a texturing bottleneck present on Polaris. I will look into it and come back with my thoughts on that.
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post #517 of 1129
Quote:
The RX 480’s on-board VRM – voltage regulator – is capable of delivering 40 amps from each phase at 125c, for a total of 240 amps.
:EEK:
post #518 of 1129
Quote:
Originally Posted by Mahigan View Post

http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

Looks like it was all made up folks.

Those guys over on the AMD forums were in fact dabbling in astro-turfing. It really is only when you overclock the RX 480 that it can pull up to 90W from the PCIe slot. When you do not overclock it... you are looking at around 73W.

I question the timing of this news after RX 480s began selling like hot cakes and nVIDIA having no response. nVIDIA also "leaked" a picture of a GTX 1060 as a means of getting buyers to hold off as well as claimed "performance" figures with exaggerated graphs.

Sounds very very dubious but I am not surprised. We are talking about nVIDIA here.

As for AMD... I will say it again... 32 ROPs??? Common... seriously. Polaris should have been equipped with 64 ROPs. There also appears to be a texturing bottleneck present on Polaris. I will look into it and come back with my thoughts on that.

Why not credit the actual source, which is PCPer?

http://www.pcper.com/reviews/Graphics-Cards/Power-Consumption-Concerns-Radeon-RX-480

1080p Tomb Raider:
Quote:
Keep in mind this is NOT with any kind of overclocking applied – everything is running at stock here. The blue line hits 85 watts and the white line (motherboard power) hits nearly 80 watts. PCI Express specifications state that the +12V power output through a motherboard connection shouldn’t exceed 66 watts (actually it is based on current, more on that later). Clearly, the RX 480 is beyond the edge of these limits but not to a degree where we would be concerned.

It may or may not actually cause any problems, but it clearly isn't made up.
Edited by Forceman - 7/1/16 at 6:46pm
post #519 of 1129
Quote:
Originally Posted by Mahigan View Post

http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

Looks like it was all made up folks.

Those guys over on the AMD forums were in fact dabbling in astro-turfing. It really is only when you overclock the RX 480 that it can pull up to 90W from the PCIe slot. When you do not overclock it... you are looking at around 73W.

I question the timing of this news after RX 480s began selling like hot cakes and nVIDIA having no response. nVIDIA also "leaked" a picture of a GTX 1060 as a means of getting buyers to hold off as well as claimed "performance" figures with exaggerated graphs.

Sounds very very dubious but I am not surprised. We are talking about nVIDIA here.

As for AMD... I will say it again... 32 ROPs??? Common... seriously. Polaris should have been equipped with 64 ROPs. There also appears to be a texturing bottleneck present on Polaris. I will look into it and come back with my thoughts on that.

Read PCPer's actual article instead of a summary. No one is astro-turfing for Nvidia.
http://www.pcper.com/reviews/Graphics-Cards/Power-Consumption-Concerns-Radeon-RX-480

The current going through the PCI-E slot is out of spec even at stock settings. There's also a third page that tests the so-called out of spec GTX 960 but it's average wattage and current are within spec even if it does spike higher than the RX 480.
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post #520 of 1129
Quote:
Originally Posted by C2H5OH View Post

Ryan at PCper tested Asus 960 Strix, as there have been rumors for GTX960 having spikes above PCIe specs.
https://www.pcper.com/reviews/Graphics-Cards/Power-Consumption-Concerns-Radeon-RX-480/Evaluating-ASUS-GTX-960-Strix
The card is well within the PCIe specs and exceeds only the technical limits of the 6pin but nothing too dangerous...
Yes, rumors perpetuated due to a test from the same source I first saw mention the RX 480's issue Conclusions basically the same as for the RX480- severe slot spikes to more power than the whole 480 typically drew.

http://www.tomshardware.com/reviews/asus-geforce-gtx-960-strix-oc-edition,4151.html#p7
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