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AMD RX 480 Review Thread - Page 246

post #2451 of 3674
Quote:
Originally Posted by sugarhell View Post

No. Vrms lose a lot of efficiency as the temps go up.

Gcn was always temp sensitive especially now with glofo

The VRM is rated at 40a/phase and 66a/phase at 125c. Temps of 110c are not an issue.
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post #2452 of 3674
Quote:
Originally Posted by KarathKasun View Post

The VRM is rated at 40a/phase and 66a/phase at 125c. Temps of 110c are not an issue.

What you dont understand that you lose efficiency and it affects the stability of the core or the memory if you overvolt with so high temps?


Do you even overclock at all? With gcn was not possible to get a high overclock on 7970 with >70C on vrms.

The same with 290x

rolleyes.gif

The vrms will not going to die but the clocks will not going to scale correctly
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post #2453 of 3674
Quote:
Originally Posted by KarathKasun View Post

The VRM is rated at 40a/phase and 66a/phase at 125c. Temps of 110c are not an issue.
OK, yes, it is rated for that, but it doent pull that much under full load.

What it DOES do is pull more power when it gets warm. Nobody is saying they wont perform, they are saying they would be more efficient at cooler temperatures, which is correct.
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post #2454 of 3674
Quote:
Originally Posted by sugarhell View Post

What you dont understand that you lose efficiency and it affects the stability of the core or the memory if you overvolt with so high temps?


Do you even overclock at all? With gcn was not possible to get a high overclock on 7970 with >70C on vrms.

The same with 290x

rolleyes.gif

The vrms will not going to die but the clocks will not going to scale correctly
Quote:
Originally Posted by GamerusMaximus View Post

OK, yes, it is rated for that, but it doent pull that much under full load.

What it DOES do is pull more power when it gets warm. Nobody is saying they wont perform, they are saying they would be more efficient at cooler temperatures, which is correct.

The first quote is pretty much saying that. Multiple people have been able to hit 1500 without even having heatsinks on the VRM because it so stupidly overspeced (600w@125c VRM on 120w chip). R9 290 VRM was nowhere NEAR as overspeced.
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post #2455 of 3674
Quote:
Originally Posted by KarathKasun View Post


The first quote is pretty much saying that. Multiple people have been able to hit 1500 without even having heatsinks on the VRM because it so stupidly overspeced (600w@125c VRM on 120w chip). R9 290 VRM was nowhere NEAR as overspeced.

Well it's still a fact the cooler you keep them the better they perform afaik.

Let's hope he got a bad chip and others can do 1400-1500mhz on lower voltages.
post #2456 of 3674
Quote:
Originally Posted by KarathKasun View Post


The first quote is pretty much saying that. Multiple people have been able to hit 1500 without even having heatsinks on the VRM because it so stupidly overspeced (600w VRM on 120w chip). R9 290 VRM was nowhere NEAR as overspeced.

Ok this is useless.

There is a difference between yeah i hit 1500 clocks and yeah i hit 1500 and the clocks scales correctly. With high temps on vrms everything is worse from stability to voltage rippling etc etc.

It's okay to run the vrms close to their safety max temps. But their efficiency is way off so close to their max SAFETY temps.

But okay i know already your answer "but this is specced for 120C"
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post #2457 of 3674
Quote:
Originally Posted by Waitng4realGPU View Post

Well it's still a fact the cooler you keep them the better they perform afaik.

Let's hope he got a bad chip and others can do 1400-1500mhz on lower voltages.

I dont think we will see above 1500 as commonplace. 1400-1450 will likely be average with 1500 being a far hope for air cooling. 1600 will be a far hope for watercooling.
Quote:
Originally Posted by sugarhell View Post

Ok this is useless.

There is a difference between yeah i hit 1500 clocks and yeah i hit 1500 and the clocks scales correctly. With high temps on vrms everything is worse from stability to voltage rippling etc etc.

It's okay to run the vrms close to their safety max temps. But their efficiency is way off so close to their max SAFETY temps.

But okay i know already your answer "but this is specced for 120C"

Yep, stuff does change as you approach the upper limit of a devices operational range. But in this case you are not going to see much if any difference, I would put money on that.
Edited by KarathKasun - 7/6/16 at 9:52am
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post #2458 of 3674
you will notice it at the wall socket. From air to water my 290x dropped 50 watts at same mhz/vcore
post #2459 of 3674
Quote:
Originally Posted by spyshagg View Post

you will notice it at the wall socket. From air to water my 290x dropped 50 watts at same mhz/vcore

And will just cooling the mosfets of the VRM give you more OC headroom? Will it allow better voltage scaling on this card? These claims have yet to be proven for this card.

This is also not a 290x, so a 50w at the wall (45w at the PSU) benefit may be an inflated expectation. That is also taking into account the GPU core temp reduction which will further reduce load wattage.
Edited by KarathKasun - 7/6/16 at 10:00am
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post #2460 of 3674
Quote:
Originally Posted by Slomo4shO View Post

Definitely odd seeing 8 64-bit 2-way memory controllers on the die configuration snapshot.

Yep, looks similar to the other GCN...
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