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[Reddit] RX 480 fails PCI-E specification - Page 98  

post #971 of 1129
Quote:
Originally Posted by EniGma1987 View Post

The RX 480 has a very powerful VRM section, leaps and bounds more capable than the GTX 1080's. The cards can easily shift 10-20% of power towards the top 3 phases with no issues and it will not trip any protections or failsafes. The high side FETs have 40A capability each at 125 degrees C, and there are 6 phases of those. The low side FETs are rated at 66A at 125 degrees C, and 94A at 70 degrees C. Think about that for a minute. Just the top 3 phases, even if voltage droop went down to 11 volts, would still be capable of well over 1000 watts on just the phases tied to the PCI-E power cable connector. Absolutely beastly.

The three output phases are only capable of ~160w at 125c. The GPU is only running at ~1v, 160A at 1v is 160w. There are also transient peaks up to 300w at stock speeds.
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post #972 of 1129
Quote:
Originally Posted by KarathKasun View Post

The three output phases are only capable of ~160w at 125c. The GPU is only running at ~1v, 160A at 1v is 160w. There are also transient peaks up to 300w at stock speeds.

Really? I thought core voltage was a little higher? Whatever. Anyway, 66A*3 = 198 amps, so even at 1v that is 198 watts capable on just the 3 phases that pull power from the PCI-E power cable, and again that is if they are running way up at 125c. I'm not saying to only draw power from them, just showing how overbuilt the thing is and capable of shifting load by the small bit Stilt and AMD are doing.

Also, I edited my post for doing the calculations on the low side before you posted, since showing the wattage of the high side is kinda pointless since the low side is more limiting.





Quote:
Originally Posted by andydabeast View Post

http://www.overclock.net/t/1604477/reddit-rx-480-fails-pci-e-specification/200_100#post_25307335
On my Corsair AX860 the two extra pins for the 8pin are split from one ground from the PSU. So essentially to make an 8pin PSU cable go into a 6pin connector all I need to to do is combine two grounds into one. I know you said I still only have six pin leads into the card but there are the same number of voltage-carrying pins going into an 8pin connector and that carries twice the wattage?! With just (effectively) one extra ground?!

I am no electrician but this looks fishy.

Standard 6 pin connectors have 2 +12v pins, though most PSUs wire it with 3 +12v now days. The 8 pin connector uses the 3rd +12v pin, which is why PSUs wire up their PCI-E connectors all with the full 3 pins of power. This allows the PSU manufacturers to simply bridge off 2 grounds to turn a 6-pin into an 8-pin, since the 2 extra pins really just tell the GPU that there is a 3rd +12v pin present. Both 6 and 8 pin PCI-E cables are both capable of well over 150 watts anyway.
Edited by EniGma1987 - 7/6/16 at 7:38am
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post #973 of 1129
Quote:
Originally Posted by EniGma1987 View Post

The RX 480 has a very powerful VRM section, leaps and bounds more capable than the GTX 1080's. The cards can easily shift 10-20% of power towards the top 3 phases with no issues and it will not trip any protections or failsafes. The high side FETs have 40A capability each at 125 degrees C, and there are 6 phases of those. The low side FETs are rated at 66A at 125 degrees C, and 94A at 70 degrees C. Think about that for a minute. Just the top 3 phases on the low side, at core voltages, are still capable of running 235 watts through them, on just those 3 phases tied to the power cable. That is already well over the cards TDP. Shifting 10-20% power to them away from the 3 phases tied to the slot is not even going to come close to stressing these VRMs. And that is calculating as if these whole VRM section was running way up at 125 degrees C! Which is well over the throttle temp points on the failsafes. We are not running up that high, and as temp is lower so is the VRMs current (and thus wattage) capability. No way these things will burn up or have any kind of early degradation.
What was the point to write a wall of text to just confirm what I stated in the post you replied to?
Quote:
Originally Posted by Ajvar 
Grantly latest is really not a big issue
post #974 of 1129
Quote:
Originally Posted by EniGma1987 View Post

Really? I thought core voltage was a little higher? Whatever. Anyway, 66A*3 = 198 amps, so even at 1v that is 198 watts capable on just the 3 phases that pull power from the PCI-E power cable, and again that is if they are running way up at 125c. I'm not saying to only draw power from them, just showing how overbuilt the thing is and capable of shifting load by the small bit Stilt and AMD are doing.

Also, I edited my post for doing the calculations on the low side before you posted, since showing the wattage of the high side is kinda pointless since the low side is more limiting.

1000w is overstating the capacity of the circuit was my point. 600w is its practical maximum, and its overrated so it can soak up the transient surges that fast response power management can induce. Under stock cooling the board under the VRM is 95c, so case temps are likely in the 105c range.
Edited by KarathKasun - 7/6/16 at 8:08am
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post #975 of 1129
it would be nice if this thread could be closed and we move on to http://www.overclock.net/t/1605039/official-amd-pcie-statement-and-new-driver-16-7-1-coming-in-24-hours#post_25322429

These threads are getting redundant.
post #976 of 1129
Quote:
Originally Posted by dagget3450 View Post

it would be nice if this thread could be closed and we move on to http://www.overclock.net/t/1605039/official-amd-pcie-statement-and-new-driver-16-7-1-coming-in-24-hours#post_25322429

These threads are getting redundant.

That thread is redundant. This discussion was here long before about that exact issue.
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post #977 of 1129
Quote:
Originally Posted by Waitng4realGPU View Post

Everyone knows AMD's financial situation it's just a boring subject and not relevant.


Warning: Spoiler! (Click to show)
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post #978 of 1129
Quote:
Originally Posted by andydabeast View Post

That thread is redundant. This discussion was here long before about that exact issue.

Except this is a reddit source thread and the other actually has a response from AMD. This thread doesnt have any updated information but a bunch of regurgitated posts.
post #979 of 1129
But we really are chewing cud at this point as we are talking about Am2/lga775 MB's that far exceed eol by 10 or so years.
AMD has officially acknowledged and address the concerns. IMHO, simple Disclaimer stating that a MB 10 or more years old are not compatible would have satisfied this.
Lets see what the new drivers do and let this one rest in the pasture.

Edit:
Are we, as enthusiast, really intend to imply that a RX 480 main audience was intended for those with a bottleneck cpu?poke.gif
Edited by EastCoast - 7/6/16 at 8:37am
post #980 of 1129
Quote:
Originally Posted by EastCoast View Post

But we really are chewing cud at this point as we are talking about Am2/lga775 MB's that far exceed eol by 10 or so years.
AMD has officially acknowledged and address the concerns. IMHO, simple Disclaimer stating that a MB 10 or more years old are not compatible would have satisfied this.

You would be surprised how many gamers are still on a Core-2-Duo (775) or X58 to early 1155 boards, not mentioning al the AM2/AM3 board out there. These systems are still doing their job. Just because AMD can not do their own job, does not mean those hardware is useless. Why throw away hardware if it still works? Besides the majority of budget gamers are an audience with almost no knowledge about PC similar to what we PC enthusiasts have.
Quote:
Originally Posted by EastCoast View Post

Lets see what the new drivers do and let this one rest in the pasture.

So let's play the usual waiting game for better AMD drivers? Sorry, but for power delivery or fan control this is not an option. They are security related parts of a graphics card and therefore should never be insecure at all. In case AMD fised this somehow in their driver, who can tell if those issues do not come back like all the other bugs AMD released in the past?

As soon as this is tested again and seemingly OK by review sites, nobody will control this anymore. Would the failure come back, your graphics card / board could be slowly damaged without the user knowing. This is so critical I could puke that all guys are so guillable and borderline stupid.

Quote:
Originally Posted by EastCoast View Post

Are we, as enthusiast, really intend to imply that a RX 480 main audience was intended for those with a bottleneck cpu?poke.gif

Generally the audience is the sub 250$ to 500$ PCs. Every low budget system from an entry level to midrange components. To mess up the power consumption here can kill the whole system.
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