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[Reddit] RX 480 fails PCI-E specification - Page 23  

post #221 of 1129
Quote:
Originally Posted by Yttrium View Post
A few quotes from the manual,

"PCI Express provides a mechanism for software controlled limiting of the maximum power per slot
that a PCI Express adapter (associated with that slot) can consume."

" Scenario 3: An Adapter Consuming 30 W
If the adapter is plugged into a form factor #1 40 W slot, the Slot Power Limit control
mechanism is followed, and the device operates normally.

If the adapter is plugged into a form factor #1 25 W slot, the Slot Power Limit control
mechanism is followed, and the device must scale down to 25 W or disable operation.

If the adapter is plugged into a form factor #2 15 W slot, the Slot Power Limit control
mechanism is followed, and the adapter must scale down to 15 W or disable operation. An
adapter that does not scale within any of the power limits for a given form factor will always be
disabled in that form factor and should not be used. "

I dont know how the motherboard 'disables' the adapter/video card in this scenario, I assume the motherboard disables it by cutting power if it doesn't want to scale down but I haven't read it completely though.

 

There are processes through which the chips that govern power supply to the GPU interface with the motherboard to tell it how much power needs to be delivered. There's a really long section about it in that whitepaper and it lists all the commands and protocols that get sent by the board and by the GPU to tell the board how much power to allocate on POST and once the system passes POST. 

 

It's quite complicated, I'll admit. I started hitting PG DN once it was clear what I was reading. My eyes needed a break.

post #222 of 1129
Quote:
Originally Posted by nagle3092 View Post

Oh no, 750ti! (FYI this is all through the PCIE bus) Warning: Spoiler! (Click to show)


 
I know I overclocked the snot out of mine and had them folding for months with no issues. Go home and find something better to do people.

Source

480 for comparison.
 
Warning: Spoiler! (Click to show)

 

Glad you brought it up. On the same Source page they show timeslices smaller and smaller. Sure there's plenty of peaks above the PCI-E spec but the average is consistently below 70W. With the 480 the reviewers showed Average consistently above the PCI-E spec. That's all.

 

 

 

Over time, the danger to cheap mobo components "Might" be revealed. I agree though it is typical of the Internet to blow everything out of proportion. I'm just surprised that the average is above the spec. Oh well.

post #223 of 1129
wow this thread is so funny,

people going crazy like a bomb just went off.,

how about we wait and see why it's cause this problem.

23 pages oh omg omg omg omg if funny:D:thumb:
post #224 of 1129
Quote:
Originally Posted by magnek View Post

No silly that gap is obviously part of the turbo exhaust manifold

From sapphires own page - 13580567_10154409365799430_64806124626963941_o.jpg
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post #225 of 1129
Quote:
Originally Posted by jellybeans69 View Post

From sapphires own page - Warning: Spoiler! (Click to show)
13580567_10154409365799430_64806124626963941_o.jpg

Nice, so it will have a backplate as well. I might have to return these XFX cards when that comes out.
 
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post #226 of 1129
Quote:
Originally Posted by Rustynails View Post

wow this thread is so funny,

people going crazy like a bomb just went off.,

how about we wait and see why it's cause this problem.

23 pages oh omg omg omg omg if funny:D:thumb:

We've been burned before, but by Nvidia last time. I guess that's a bad pun. (GTX 970 3.5GB fast Vram fiasco, 0.5 GB extremely slow Vram) 

 

To put it in perspective for me personally. I was Octane Rendering at the time and had spent considerable time optimizing my content to stay under 4GB memory, 3.7GB to be exact leaving some fluff room. I bought (7) 970's for my ASUS WS motherboard useable with PCI-E Risers... Basically the "Surprise" wasted my time and purchase.

 

Thankfully I sold all but one of the cards to OCN members at huge discounts as I had slapped Waterblocks on them etc... 

 

So many don't trust the GPU makers apparently. :D

post #227 of 1129
Quote:
Originally Posted by jellybeans69 View Post

From sapphires own page - 13580567_10154409365799430_64806124626963941_o.jpg

What the heck...? The face plate doesn't even line up with the heat sink at all. It's almost like they secretly want these cards to overheat.
post #228 of 1129
Quote:
Originally Posted by aweir View Post

What the heck...? The cosmetic grill doesn't even line up with the heat sink at all. It's almost like they secretly want these cards to overheat.

Since this is a not blower style card there's not as much need to have a big, gaping opening on the back. Perhaps I'm misunderstanding you but I don't see anything in that picture which leads me to believe there are problems with the cooling solution.
post #229 of 1129
Quote:
Originally Posted by Ghoxt View Post

Glad you brought it up. On the same Source page they show timeslices smaller and smaller. Sure there's plenty of peaks above the PCI-E spec but the average is consistently below 70W. With the 480 the reviewers showed Average consistently above the PCI-E spec. That's all.
Warning: Spoiler! (Click to show)




Over time, the danger to cheap mobo components "Might" be revealed. I agree though it is typical of the Internet to blow everything out of proportion. I'm just surprised that the average is above the spec. Oh well.

Yeah at stock its average is lower. What happens when you overclock them? Does it exceed then? My guess is yes and I am sure alot people who own them overclocked them. Anyone ever hear about 750tis killing mobos? I know I was folding on mine for months with zero issues and mine were powered by pcie only as well.

I take it as yes there is a spec that is set and I am not denying that the card is exceeding it. But I refuse to believe that a board is going to die running one of these. Just like 75w is spec for a six pin yet most of us know that you can pull almost 200w through the damn thing with no issues.

The same people making a fuss about this probably run their cpu, ram or gpus out of spec by overclocking them and they dont care then so why should they now? Oh I know why, its AMD related.
 
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post #230 of 1129
Quote:
Originally Posted by aweir View Post

What the heck...? The face plate doesn't even line up with the heat sink at all. It's almost like they secretly want these cards to overheat.
It's not a blower card, so the backplate vents don't really matter.
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