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[Reddit] RX 480 fails PCI-E specification - Page 3  

post #21 of 1129
According to reviewers who are most likely just following the reviewer's guides issued by AMD, I read these reference cards are being referred to as "Made by AMD" so this is definitely AMD's fault.
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post #22 of 1129
https://www.techpowerup.com/reviews/AMD/RX_480/22.html

Typical gaming load: 163 watts

So even if during testing it didn't pull over spec from the pcie slot, it pulled over spec from the 6pin.
Either way could be bad. If someone is using a low enough quality psu in a low airflow case, pulling over spec from the 6pin could cause serious problems.
post #23 of 1129
They're not talking about the 6pin auxiliary power. AMD havent cared about meeting those specifications in the past (7990, 295X2, etc). They are talking about it pulling more than it should from the PCI-E slot itself. A 6pin is completely capable of pulling the same draw an an 8pin. The 8pin just has 2 extra grounds and is a way of 'making sure' that the PSU was capable of delivering the 'high wattage' requirement back when it came out.

How are they measuring the power draw from specifically the PCIE slot though?
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post #24 of 1129
Quote:
Originally Posted by Alex132 View Post

They're not talking about the 6pin auxiliary power. AMD havent cared about meeting those specifications in the past (7990, 295X2, etc). They are talking about it pulling more than it should from the PCI-E slot itself. A 6pin is completely capable of pulling the same draw an an 8pin. The 8pin just has 2 extra grounds and is a way of 'making sure' that the PSU was capable of delivering the 'high wattage' requirement back when it came out.

How are they measuring the power draw from specifically the PCIE slot though?

As a note of clarification it's actually 1 extra ground and 1 extra sense pin but yeah, same power pins.
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post #25 of 1129
Wow. At first glance this doesn't really seem to be a problem but after reading everything it's quite serious.

So how could AMD let this happen and what kind of fixes could there be?
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post #26 of 1129
Damn, AMD is in trouble again.
    
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post #27 of 1129
Quote:
Originally Posted by Alex132 View Post


How are they measuring the power draw from specifically the PCIE slot though?

by measuring the DC in a riser card
post #28 of 1129
Quote:
Originally Posted by Alex132 View Post

They're not talking about the 6pin auxiliary power. AMD havent cared about meeting those specifications in the past (7990, 295X2, etc). They are talking about it pulling more than it should from the PCI-E slot itself. A 6pin is completely capable of pulling the same draw an an 8pin. The 8pin just has 2 extra grounds and is a way of 'making sure' that the PSU was capable of delivering the 'high wattage' requirement back when it came out.

How are they measuring the power draw from specifically the PCIE slot though?

Yeah, you are right - from http://www.tomshardware.com/reviews/radeon-r9-295x2-review-benchmark-performance,3799-14.html - "The two-generation-old Radeon HD 6990 pulls way more power from the PCI Express slot, with peak values that exceed the PCI-SIG's 75 W specification."
post #29 of 1129
I blame WattMan, dude failed to power gate properly.
post #30 of 1129
Thread Starter 
Quote:
Originally Posted by Alex132 View Post

A 6pin is completely capable of pulling the same draw an an 8pin. The 8pin just has 2 extra grounds and is a way of 'making sure' that the PSU was capable of delivering the 'high wattage' requirement back when it came out.

That's not true. The 6-pin power PEG is rated for 75 watts. The 8-pin power PEG is rated for 150 watts.


http://www.tomshardware.co.uk/power-supply-specifications-atx-reference,review-32338-12.html
Edited by ProclusLycaeus - 6/29/16 at 5:49pm
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