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[Reddit] RX 480 fails PCI-E specification - Page 7  

post #61 of 1129
Quote:
Originally Posted by Zer0CoolX View Post

This is disappointing. Was gonna get a GTX 1070 but price gouging is making that undesirable (especially given custom cards being more expensive than ref). Then I was considering the RX480, and then this happens. Ugh

Non ref RX 480s should be fine.

As long as you aren't doing VR, last gen cards like a Fury or a 980 TI are still a good buy if you can pick them up cheap, which should be easy now. Hell, the Nano is basically a 4GB 480 plus some.
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post #62 of 1129

 

This past week I've learned that you really love power-connector specs. I mean this as a compliment, for I am science.

     
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post #63 of 1129
Ok people, lots of false info is going around so let's educate a bit.

Nobody should care if the card exceeded its rated total TDP by drawing extra 20-30W from the 6pin connector, or have really high peaks for short periods of time.
What matters is the current which passes through a conductor(wire) should not be higher than what the physical dimensions of the conductor allow(diameter), as this would result in the copper and in turn of its surrounding insulation(yellow plastic) to overheat over time.

Most cards with extra power connectors have some ridiculous peaks like 1.5-2 times their TDP, but no more than a fraction of a second which means that you can draw 100W for 0.9sec and then have a peak of 300W for 0.1sec, but in reality the average would be 120W. (100Wx0.9sec + 300Wx0.1sec = 90W+30W = 120W)

The 6pin has three +12V wires that can handle AT LEAST 3A each - and yes even crappy PSUs will have these - which means a 6pin can handle AT LEAST 100Watts by itself.. 12x3A=36A x3 wires = 108W)

The REAL problem is that review sites have confirmed that the card is drawing on average more than 75Watts from the motherboard pci-e slot, it is not some random peak values and it doesnt happen for a short amount of time, it is drawing 79+W for extended periods of time.

Most cards up until now have not been drawing more than 60-70W of power from the slot, but prefer to draw from the extra connectors.
The PCI-E CEM 2.0 specifications state that a slot is rated for +12V @ 5.5A MAX(66W) and for +3.3V @ 3A MAX(10W), which would translate in 76W total MAX but it goes on to say that when both used the total should not exceed 75W.
If this happened on a high-end card, it wouldn't matter much since it would probably be installed on a good motherboard assembled with good or top quality parts and over-provision, in case a card tried to draw absolute max.

But many people who will buy this card will have budget mobos, which as we know might have cut corners here and there or assembled by lower quality parts, keep in mind that they can all handle small peaks but i'm sure the slots are only able to handle 75+W for limited time.
Most of these people are not members of OCN or any other tech site, they just heard from a friend about that new cheap card and decided to buy it on their low-end pc. If after some time their slot begins to malfunction who is going to take the blame, their old motherboard or that new card from AMD?
This could really backfire really bad for AMD

Class over.
Edited by Marios145 - 6/30/16 at 7:12am
post #64 of 1129
Quote:
Originally Posted by SuperZan View Post


This past week I've learned that you really love power-connector specs. I mean this as a compliment, for I am science.
what can i say?

it took me years to find the real ones so . .i want to "show off" biggrin.gif
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post #65 of 1129

lachen.gif

Perfect, so much for the 75W BS lol.
Quote:
Originally Posted by SuperZan View Post

This past week I've learned that you really love power-connector specs. I mean this as a compliment, for I am science.

It makes him feel powerful. ( ͡° ͜ʖ ͡°)
post #66 of 1129
What the terminals can handle is one thing, they have to over-provision so that they don't become too hot and don't melt and don't catch fire; what the PSU itself can handle is another thing.
 
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post #67 of 1129
Quote:
Originally Posted by magnek View Post


lachen.gif

Perfect, so much for the 75W BS lol.

It makes him feel powerful. ( ͡° ͜ʖ ͡°)

 

One of my lab monkeys was walking by and gave me a very quizzical look as I laughed out loud at that. <3 overnights.

     
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post #68 of 1129
Quote:
Originally Posted by tpi2007 View Post

What the terminals can handle is one thing, they have to over-provision so that they don't become too hot and don't melt and don't catch fire; what the PSU itself can handle is another thing.

and OCers like kingpin are happy with over provisioning while pushing ~92 to 135 amp in a pair of 8 and single 6 pins. thumb.gif
Warning: Spoiler! (Click to show)
Quote:
Running GT1 test with higher clocks&voltage, ~92A (1100W), max peak is 135A (1625W!), 1950MHz 1.74V
http://forum.kingpincooling.com/showthread.php?t=3820
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post #69 of 1129
Quote:
Originally Posted by SuperZan View Post

One of my lab monkeys was walking by and gave me a very quizzical look as I laughed out loud at that. <3 overnights.

You should play Overwatch on overnights. Overwatch coz you're the supervisor and everything so gotta watch over dem lab donkeys.
Quote:
Originally Posted by looniam View Post

and OCers like kingpin are happy with over provisioning while pushing ~92 to 135 amp in a pair of 8 and single 6 pins. thumb.gif
Warning: Spoiler! (Click to show)

I'm amazed it didn't go out in a blaze of glory. devil.gif


Should I stahp? Yeah ok I should probably stahp.
post #70 of 1129
its fine going above the power connector limit but not the pci and that is the issue here.
i think its better to hold a week to get a premium card, you will be able to pump more juice for that oc at decent fan noise.
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