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[Reddit] RX 480 fails PCI-E specification - Page 32  

post #311 of 1129
Quote:
Originally Posted by ElCheapo View Post

Now that the TDP of the card exceeding 150W

TDP = THERMAL Design Power

This relates to the amount of cooling necessary for the GPU. The RX 480 GPU is only pulling about 110W, so it is pulling less than the TDP.

TBP, however, is not commonly discussed - but most treat TDP as if it were TBP (typical board power).

RAM has a significant impact on power consumption. I'd love to see some RAM underclocking tests on the RX 480 - as I underclock my own RAM on my R9 290 to save oodles of power.
post #312 of 1129
Quote:
Originally Posted by Waitng4realGPU View Post

But then it would be clearly below the 970 and 390 in benchmarks and they'd only be able to charge $169 rather than $199 as a base MSRP?

Nope. The numbers seem like they don't work, but they work very well.

RX 480 has 2304 SPs at 1.266Ghz (max) - or the equivalent of 2916 SPs at 1Ghz.

2816 SPs at 1.1Ghz is equal to ~3098 SPs at 1Ghz.

That's an extra 6% more performance at the same power, just by using a very slightly larger die.
post #313 of 1129
Quote:
Originally Posted by ElCheapo View Post

So from what I see- drawing more than 75W from the PCI-E won't be helped by adding an 8-pin or a second 6-pin. That's kind of ridiculous to be calling that the magic bullet. Now that the TDP of the card exceeding 150W that would be in-line with the sole 6-pin connector usage would be fixed by that. However, I don't see the TDP going up, it sounds like there's a software/bios error, issue, or a user-side problem with the software or their rig. I don't see the reference models getting a second 6-pin to be 165W, the opposite seems more likely to me. The excessive PCI-E draws sounds like it's going to need a different fix since it'd still be drawing too much with an extra couple pins or connector.

Historically, GPUs with 6/8-pin connectors regulate the draw on those links separately from PCIe power, allowing the former to climb higher than the latter. The 480 has seven power phases, but we don't have specifics on their wiring. It appears to be three for slot +12V power, three for 6-pin, and one for VRAM. I don't believe they are allowed to be tied to a common bus on the card, so the 480 *should* be able to control them independently, and pull more from the 6-pin than the slot. What exactly it will take to make such a change is beyond our current level of knowledge, as we don't know what amount of field-updating AMD can do to their end-user cards.
post #314 of 1129
Quote:
Originally Posted by looncraz View Post

Nope. The numbers seem like they don't work, but they work very well.

RX 480 has 2304 SPs at 1.266Ghz (max) - or the equivalent of 2916 SPs at 1Ghz.

2816 SPs at 1.1Ghz is equal to ~3098 SPs at 1Ghz.

That's an extra 6% more performance at the same power, just by using a very slightly larger die.

Ah sorry I didn't read your post I quoted properly. Didn't realise you had added more stream processors. Yeah that makes sense now.

I was thinking identical chip underclocked.
post #315 of 1129
Quote:
Originally Posted by Waitng4realGPU View Post

The single 6 pin connector attracts the customers that have cheap and shoddy prebuilts etc.
Right, but then isn't that talking about solving a separate problems? That seems like the solution to if you want to draw more than 150W,. Putting a second 6-pin or an 8 pin connector won't magically stop it from drawing more power through the board if the problem lies in the software or the bios- it's just it'll have to use an 8 pin or second 6 pin in order to do it. What's more, trying to solidify it as a more efficient card than the 970 won't be helped by not fixing the inherent problems seeing it draw more than 150W. If they're aiming this largely at people with low-end boards then they'll want to lower the power draw through the PCI-E and rest of the power draw for that matter- not ready it for more.
Quote:
Originally Posted by malventano View Post

Historically, GPUs with 6/8-pin connectors regulate the draw on those links separately from PCIe power, allowing the former to climb higher than the latter. The 480 has seven power phases, but we don't have specifics on their wiring. It appears to be three for slot +12V power, three for 6-pin, and one for VRAM. I don't believe they are allowed to be tied to a common bus on the card, so the 480 *should* be able to control them independently, and pull more from the 6-pin than the slot. What exactly it will take to make such a change is beyond our current level of knowledge, as we don't know what amount of field-updating AMD can do to their end-user cards.
Indeed we don't. And it sounds like they've got to recreate the problem, determine the cause, and then they can come up with a solution. I'd be surprised if they're not going back/forth with the reviewers who had those results to attempt to isolate the problem and the fix for them as well.
Edited by ElCheapo - 6/30/16 at 10:27pm
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post #316 of 1129
Quote:
Originally Posted by malventano View Post

Historically, GPUs with 6/8-pin connectors regulate the draw on those links separately from PCIe power, allowing the former to climb higher than the latter. The 480 has seven power phases, but we don't have specifics on their wiring. It appears to be three for slot +12V power, three for 6-pin, and one for VRAM. I don't believe they are allowed to be tied to a common bus on the card, so the 480 *should* be able to control them independently, and pull more from the 6-pin than the slot. What exactly it will take to make such a change is beyond our current level of knowledge, as we don't know what amount of field-updating AMD can do to their end-user cards.

For both Kepler and Maxwell cards, the bios controlled the allowed range of power draw on each rail, and there was a separate entry in the power table for each available power source. So I'd expect this to be something programmed into the bios.
post #317 of 1129
Quote:
Originally Posted by Iscaria View Post

Guys I've been running benchmarks on my Sapphire RX 480 8GB with a 5 year old mobo all night and nothing even close to alarming has happened. Power and temps have both been in comfortable ranges. Either I'm a lucky one or this issue is largely overblown.

 

Thanks, that's what OCN should value. our own members testing with the cards firsthand.

+Rep

post #318 of 1129
Quote:
Originally Posted by Iscaria View Post

Guys I've been running benchmarks on my Sapphire RX 480 8GB with a 5 year old mobo all night and nothing even close to alarming has happened. Power and temps have both been in comfortable ranges. Either I'm a lucky one or this issue is largely overblown.

Yeah no run Furmark 24/7 for a month and then we can talk.

/s
post #319 of 1129
Quote:
Originally Posted by ElCheapo View Post

. And it sounds like they've got to recreate the problem, determine the cause, and then they can come up with a solution..

Thats normal procedure.
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post #320 of 1129
Quote:
Originally Posted by AmericanLoco View Post

Half the people here probably never even heard of Socket 939, let alone some weird no-name "DFI" board tongue.gif

This is good for overclocking the card.
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Overclock.net › Forums › Industry News › Hardware News › [Reddit] RX 480 fails PCI-E specification