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AMD RX 480 Review Thread - Page 247

post #2461 of 3674
Quote:
Originally Posted by KarathKasun View Post

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.

I'm no engineer, but with with some basic knowledge higher temps/lower efficiency should cause higher ripple in the current. The greater the ripple, the worse stability will be as with more jumps in current and subsequently vcore, the more likely you are to artifact or be right on the wall of stability due to higher fluctuation.

How much better power delivery and better cooled vrms will help is yet to be seen.
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post #2462 of 3674
Quote:
Originally Posted by KarathKasun View Post

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.


I' am not trying to prove anything. Just making it very clear that cooling has a dramatic effect on power consumption when I compared what my card consumed VS the rx480 with the same 16k score.


My card consumed ~360watts with full cover WC with vrm's at ~45ºc while that rx480 had them at 105ºc, making the comparison skewed towards the 290x.


Meaning, under the same vrm temps my 290x would have consumed ~410 watts VS 300w of the rx480.


And yes, vrm temp affects overall gpu clock assuming there isn't a bottleneck elswwhere.
post #2463 of 3674
Quote:
Originally Posted by rv8000 View Post

I'm no engineer, but with with some basic knowledge higher temps/lower efficiency should cause higher ripple in the current. The greater the ripple, the worse stability will be as with more jumps in current and subsequently vcore, the more likely you are to artifact or be right on the wall of stability due to higher fluctuation.

How much better power delivery and better cooled vrms will help is yet to be seen.

That is pretty much my point. The increase in ripple is usually only apparent at the far end of the available power delivery capability of the VRM. At lower loads the effect is much less. This is why I do not expect superior VRM cooling to make much of a difference in achievable clocks on the RX 480.

You may get 10-20% better VRM efficiency, which means 30w when you are at the upper end of what the chip itself is capable of.
Edited by KarathKasun - 7/6/16 at 10:35am
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post #2464 of 3674
Gentlemen, any news on a Nitro release date?
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post #2465 of 3674
Quote:
Originally Posted by keikei View Post

Gentlemen, any news on a Nitro release date?

Nothing other than "July" as far as anyone has reported.
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post #2466 of 3674
Quote:
Originally Posted by spyshagg View Post

1180mhz
16005 graphics score

http://www.3dmark.com/fs/7865089





I was maybe using 350 watts at those low clocks (1180). So, not far off from RX480 (300)

Just curious how your 290x at 1180 / 1600 is scoring just shy of 2k graphics score points higher than my 290x at 1150 / 1500... ?

http://www.3dmark.com/3dm/12990964?

Edit:

Oh.. I see you are using much older drivers and have changed settings in them such as tesselation... Can you do a run on recent drivers without changing settings for comparisons sake to the rx480?

Quote:
Originally Posted by sugarhell View Post

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

My XFX Double D 7970ghz ran at 1225mhz / 1600mhz despite pretty high vrm temps - had no stability issues and is still being used overclocked in another machine to this day.
Edited by SoloCamo - 7/6/16 at 10:45am
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post #2467 of 3674
Quote:
Originally Posted by KarathKasun View Post

That is pretty much my point. The increase in ripple is usually only apparent at the far end of the available power delivery capability of the VRM. At lower loads the effect is much less. This is why I do not expect superior VRM cooling to make much of a difference in achievable clocks on the RX 480.

You may get 10-20% better VRM efficiency, which means 30w when you are at the upper end of what the chip itself is capable of.

Either way it should help, whether its by 15mhz or by 50 is yet to be seen.

High ripple before filtering won't just disappear, the effects will be less, but still there as efficency gets worse due to temps.
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post #2468 of 3674
Quote:
Originally Posted by SoloCamo View Post

Just curious how your 290x at 1180 / 1600 is scoring just shy of 2k graphics score points higher than my 290x at 1150 / 1500... ?

http://www.3dmark.com/3dm/12990964?

Edit:

Oh.. I see you are using much older drivers and have changed settings in them such as tesselation... Can you do a run on recent drivers without changing settings for comparisons sake to the rx480?

Yes it was without tess, with old drivers. Today that score would be around 16400.


Heres one from last month with 1150/1450 with tess on. (my 24/7 settings)

http://www.3dmark.com/fs/8750578

Modded bios + strap timing tweaks,
post #2469 of 3674
Quote:
Originally Posted by SoloCamo View Post

Just curious how your 290x at 1180 / 1600 is scoring just shy of 2k graphics score points higher than my 290x at 1150 / 1500... ?

Oh.. I see you are using much older drivers and have changed settings in them such as tesselation... Can you do a run on recent drivers without changing settings for comparisons sake to the rx480?
My XFX Double D 7970ghz ran at 1225mhz / 1600mhz despite pretty high vrm temps - had no stability issues and is still being used overclocked in another machine to this day.

Those scores did look rather high. Yours look more along the lines of the average 290X. The 480 at 1350-1400mhz should be around that level.

That is a nice 7970 chip if it ran 1225/1600 game stable with high vrm temps.
post #2470 of 3674
well yeah my scores are high but any 290x on the market today can have that performance. The bios mods are available to anyone.
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