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Polaris RX 480 / RX 470 / RX 460 Discussion Thread - Page 78  

post #771 of 991
Where is 470?
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post #772 of 991
Quote:
Originally Posted by TheLAWNOOB View Post

Where is 470?

Being binned from discarded 480s as AMD tries to get more dies out to AIB partners for custom 480s at the same time wink.gif
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post #773 of 991
Based on how huge the variation in the process is, I'd say RX 470 won't have issues with the supply... According to the GPU-Z internal database, the leakage (ASIQ "Quality") on RX 480 is varying between 62.4% - 94.7% ph34r-smiley.gif And that's just after ~ three weeks of the product being available.
post #774 of 991
Say... if I sold my Nano for $350 and added around $200, I could get two nonreference 480s... Hmm... As a prospective ETH miner, I might do that.
Edited by Sonikku13 - 7/22/16 at 11:38pm
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post #775 of 991
Quote:
Originally Posted by Sonikku13 View Post

Say... if I sold my Nano for $350 and added around $200, I could get two nonreference 480s... Hmm... As a prospective ETH miner, I might do that.

I'd consider trading my 480+ for your nano.
post #776 of 991
Quote:
Originally Posted by The Stilt View Post

Based on how huge the variation in the process is, I'd say RX 470 won't have issues with the supply... According to the GPU-Z internal database, the leakage (ASIQ "Quality") on RX 480 is varying between 62.4% - 94.7% ph34r-smiley.gif And that's just after ~ three weeks of the product being available.

Forgive my noobness but is the 62.4%-94.7% good? You mention it being just after a few weeks, what does that mean in context?
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post #777 of 991
Quote:
Originally Posted by Robenger View Post

Forgive my noobness but is the 62.4%-94.7% good? You mention it being just after a few weeks, what does that mean in context?

Variation in leakage current between the specimens. That range includes every single card, on which the user has checked the "ASIC Quality" while being connected to the internet. On a mature and high yield process you should see less than ~15% variation between the specimens. Over 51% is just absurd. Higher the value (ASIC Quality, i.e LeakageID), higher the leakage current of the ASIC is and vice versa.
Edited by The Stilt - 7/23/16 at 12:42am
post #778 of 991
Quote:
Originally Posted by The Stilt View Post

Variation in leakage current between the specimens. That range includes every single card, on which the user has checked the "ASIC Quality" while being connected to the internet. On a mature and high yield process you should see less than ~15% variation between the specimens. Over 51% is just absurd. Higher the value (ASIC Quality, i.e LeakageID), higher the leakage current of the ASIC is and vice versa.

So is that why they're having higher than expected power draw on the 480? Is it because of the leakage? I hope I'm understanding this right.
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post #779 of 991
Quote:
Originally Posted by Robenger View Post

So is that why they're having higher than expected power draw on the 480? Is it because of the leakage? I hope I'm understanding this right.

Not necessarily. Higher leakage parts in most cases require lower voltage to operate than parts with lower leakage characteristics. That's why the default voltage is calculated by the VBIOS and the display driver, based on leakage. In some cases (e.g extreme cooling or voltage limit by the design), higher leakage is desireable but in most scenarios you'll want a specimen with as little leakage as possible. A ASIC with lower leakage characteristics will run cooler and generally be more power efficient. Lower current draw means higher VRM efficiency and lower conduction losses so the whole card will be running cooler because of that.

IMO the cards are simply pushed too far beyond their most efficient operating parameters (defined by the design and especially the manufacturing process) at stock.
post #780 of 991
Quote:
Originally Posted by The Stilt View Post

Not necessarily. Higher leakage parts in most cases require lower voltage to operate than parts with lower leakage characteristics. That's why the default voltage is calculated by the VBIOS and the display driver, based on leakage. In some cases (e.g extreme cooling or voltage limit by the design), higher leakage is desireable but in most scenarios you'll want a specimen with as little leakage as possible. A ASIC with lower leakage characteristics will run cooler and generally be more power efficient. Lower current draw means higher VRM efficiency and lower conduction losses so the whole card will be running cooler because of that.

IMO the cards are simply pushed too far beyond their most efficient operating parameters (defined by the design and especially the manufacturing process) at stock.

I love your posts.
 
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