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[Reddit] RX 480 fails PCI-E specification - Page 63  

post #621 of 1129
Quote:
Originally Posted by looniam View Post


also someone mentioned they didn't bridge the pci-e and the 6 pin connector. well if they did THEN the card would be non compliant.
Warning: Spoiler! (Click to show)
since both power sources are to be kept separately.

moral of the story:

don't trust chat rooms.
Good find. I always wondered what would happen if one connector was at 11.5 and the other was at 12.5.
post #622 of 1129
Thread Starter 
Quote:
Originally Posted by Dargonplay View Post

This is so hilarious lachen.gif


Are you dense? That video is just showing what Toms Hardware shown.

Watch the damn video again. At the 1:40 minute mark he talks about how the RX 480 pulls 80 watts through the PCIe connector and how that is over the 75w. It's actually, as I have said and others have shown, 66 watts of 12V power.

They talks about the Strix 960 at the 3 minute mark and he even says that the load averages 60 watts. When he talks about the 250 watt peak, what is the picture he is wiggling his mouse over say?

That's right, it says "Power Consumption PEG - 75W limit value". That is the 6-pin connector. That is NOT the PCIe motherboard connector.

You are watching a video of someone else who is totally misunderstanding what SOMEONE ELSE did the research on.

Here is the damn link to Toms Hardware for the GTX 960. http://www.tomshardware.com/reviews/nvidia-geforce-gtx-960,4038-8.html

If you bother to look on that page, you will see that the PCIe Average is BELOW 60 watts.

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post #623 of 1129
Thread Starter 
Quote:
Originally Posted by Vowels View Post

The problem is that the target market for the RX 480 are the budget builders who likely have budget motherboards. Those boards will be built with little, if any, tolerance to save costs.

It's just a problem that could have entirely been avoided if AMD had used an 8-pin in the first place with a better 70/30 split for power distribution.

EXACTLY!

You aren't going to put a $200 video card on a $500 overclockers motherboard. This card was designed to go on $40-80 lower end budget build motherboards.

+rep
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post #624 of 1129
Quote:
Originally Posted by ProclusLycaeus View Post

Are you dense? That video is just showing what Toms Hardware shown.

Watch the damn video again. At the 1:40 minute mark he talks about how the RX 480 pulls 80 watts through the PCIe connector and how that is over the 75w. It's actually, as I have said and others have shown, 66 watts of 12V power.

They talks about the Strix 960 at the 3 minute mark and he even says that the load averages 60 watts. When he talks about the 250 watt peak, what is the picture he is wiggling his mouse over say?

That's right, it says "Power Consumption PEG - 75W limit value". That is the 6-pin connector. That is NOT the PCIe motherboard connector.

You are watching a video of someone else who is totally misunderstanding what SOMEONE ELSE did the research on.

Here is the damn link to Toms Hardware for the GTX 960. http://www.tomshardware.com/reviews/nvidia-geforce-gtx-960,4038-8.html

If you bother to look on that page, you will see that the PCIe Average is BELOW 60 watts.


I think you're the one who's misunderstanding everything.




That is directly from Tomshardware, it shows the results of their testing.

"This is because the otherwise very good Asus GTX 960 Strix leaves the motherboard connector to deal with unprecedented unfiltered power spikes all on its own"

I don't even what you're having but it looks strong as hell.
post #625 of 1129
Quote:
Originally Posted by ProclusLycaeus View Post

Are you dense? That video is just showing what Toms Hardware shown.

Watch the damn video again. At the 1:40 minute mark he talks about how the RX 480 pulls 80 watts through the PCIe connector and how that is over the 75w. It's actually, as I have said and others have shown, 66 watts of 12V power.

They talks about the Strix 960 at the 3 minute mark and he even says that the load averages 60 watts. When he talks about the 250 watt peak, what is the picture he is wiggling his mouse over say?

That's right, it says "Power Consumption PEG - 75W limit value". That is the 6-pin connector. That is NOT the PCIe motherboard connector.

You are watching a video of someone else who is totally misunderstanding what SOMEONE ELSE did the research on.

Here is the damn link to Toms Hardware for the GTX 960. http://www.tomshardware.com/reviews/nvidia-geforce-gtx-960,4038-8.html

If you bother to look on that page, you will see that the PCIe Average is BELOW 60 watts.


Actually PEG is the PCIe x16 slot, while "PCI-E total 12V" is the aux 6 pin. So the correct graph would've been this one:



Doesn't change your conclusion, but thought I'd point it out.
post #626 of 1129
Thread Starter 
PEGs are the the power cables by just about everyone, including Toms Hardware.

http://www.tomshardware.co.uk/power-supply-specifications-atx-reference,review-32338-12.html
Quote:
Even though the specification allows for a delivery capability of 75 W (six-pin connector) or 150 W (eight-pin connector), the total power-handling capacity of these connectors is at least 192 and 288 W, respectively, using standard terminals, and even more using the HCS or Plus HCS terminals.

These two auxiliary power connectors are sometimes called PCI Express Graphics (PEG)


http://www.antec.com/PSU/
Quote:
All together, a graphics card could theoretically have a power consumption of up to 300 Watts. And, as you can see, regardless of which graphics card you use, there is more than one way for power to be distributed to it: 75W at 6.25A, just from the PCI-E slot, and up to another 200W (at around 17A) from each PCI-E Graphics (PEG) connector.

https://www.techpowerup.com/136908/evga-intros-power-boost-gadget-to-improve-pci-e-power-stability
Quote:
Case in point, PEG connectors.

6-pin and 8-pin PEGs have the same amount of 12v wires. True story, 3 apiece, although in the 6-pin, one might as well be disconnected because it isn't needed. The 6-pin connector is rated at 8A (itself a safe spec), but the pci-e spec is 6.5A (75W). So each 12v line pulls 2ish amps max in a 6-pin plug...compared to a molex plug that is specced at twice that, and rated for three times as much. The 8-pin uses all three 12v lines, and pulls up to 4A apiece (150w/12v/3=4.16_A), the EXACT same as the molex spec, but uses an enormous amount of grounds. If you can subtract, you would say 5. You would be right. If you think that is overkill, you would be right.

http://www.guru3d.com/articles-pages/amd-radeon-r9-rx-480-8gb-review,1.html
Quote:
The Radeon RX 480 is based on a much smaller 14nm fabrication process, as such you will see many enhancements in efficiency and that shows in power consumption, the reference cards will use just one 6-pin power PEG (PCI Express Graphics) header to give the the card its power.

https://us.hardware.info/reviews/5221/4/nvidia-geforce-gtx-750--750-ti-review-the-first-maxwell-generation-gpus-geforce-gtx-750-and-750-ti
Quote:
According to Nvidia, the lack of a PEG connector makes the Geforce GTX 750 (Ti) the ideal upgrade for "your neighbour's PC". Many of the OEM machines manufactured by companies such as HP, Acer and Dell do indeed have a PCI Express x16 expansion slot, but no power supply with a PEG connector.


http://i.stack.imgur.com/riwGR.png



etc, etc, etc.


But I have grown bored with the "But, but, but NVIDIA" crap. Let's get back to the issue at hand ... the RX 480 draws too damn much from the PCIe slot, which has 5 connectors rated at 1.1A each for a total of 5.5A, and at 12VDC, that is 66 watts.
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post #627 of 1129
Quote:
Originally Posted by ProclusLycaeus View Post

PEGs are the the power cables by just about everyone, including Toms Hardware.

http://www.tomshardware.co.uk/power-supply-specifications-atx-reference,review-32338-12.html
http://www.antec.com/PSU/
https://www.techpowerup.com/136908/evga-intros-power-boost-gadget-to-improve-pci-e-power-stability
http://www.guru3d.com/articles-pages/amd-radeon-r9-rx-480-8gb-review,1.html
https://us.hardware.info/reviews/5221/4/nvidia-geforce-gtx-750--750-ti-review-the-first-maxwell-generation-gpus-geforce-gtx-750-and-750-ti
http://i.stack.imgur.com/riwGR.png



etc, etc, etc.


But I have grown bored with the "But, but, but NVIDIA" crap. Let's get back to the issue at hand ... the RX 480 draws too damn much from the PCIe slot, which has 5 connectors rated at 1.1A each for a total of 5.5A, and at 12VDC, that is 66 watts.

So, now that its been proven that a Nvidia GTX 960 can draw more than 200W from the PCIe motherboard slot alone you get bored.

Not only that you want everyone to focus on the RX 480 instead of the GTX 960?

Classy.
post #628 of 1129
Quote:
Originally Posted by Dargonplay View Post

So, now that its been proven that a Nvidia GTX 960 can draw more than 200W from the PCIe motherboard slot alone you get bored.

Not only that you want everyone to focus on the RX 480 instead of the GTX 960?

Classy.

Because its whataboutism. What's the whole point of shifting attention away from the RX 480, which people bought thousands of just recently, to a card that is EOL? If you guys want to have a discussion about the 960 there's nothing stopping you from making a thread about it.
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post #629 of 1129
Quote:
Originally Posted by NuclearPeace View Post

Because its whataboutism. What's the whole point of shifting attention away from the RX 480, which people bought thousands of just recently, to a card that is EOL? If you guys want to have a discussion about the 960 there's nothing stopping you from making a thread about it.

Because it proves that this whole deal have been ignited just because its AMD.

The GTX 950 have sold 10 times more than what the RX 480 probably will in this quarter yet no eyebrows were raised when the tests showed the GTX 950 spiking way above the 75W the motherboard PCIe slow was rated for, so why is this issue finally coming to light now? Why not before?

Ignorance is not the reason as the tests were there, proving how much those cards spiked above the 75W the motherboard was rated, it's just that nobody cared because Nvidia.

Whats the point of shifting all attention into one card that presents an issue that 90% of current and past cards present?
post #630 of 1129
Quote:
Originally Posted by Derp View Post

https://bitcointalk.org/index.php?topic=1433925.msg15438155#msg15438155



This is the worst case scenario, three cards mining.

This doesn't seem right to me. thinking.gif

The damages seem to be on the 3.3v and ground...while Rayan (from PCPer) shows that the stress (~7A) is on the 12v rail.

And I though the possible damage is with the PCIe slot, not the 24pin mobo connector.
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