Topic Title: radeon power requirements
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Created On: 05/08/2014 09:03 PM
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 05/08/2014 09:03 PM
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Vegan
Elite

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at the low end AMD has cards that are easy on the PSU, at the other end of the market they have cards that I like to call power pigs.

I saw some propoganda that at idle, cards are now using less power, so does radeon do anything like cap the power level for desktop use etc?

how about shut down the other 3 gpus when on desktop etc?

 



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 05/08/2014 10:56 PM
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Vantharas
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They do go read about zero core tech they do supposedly the other card will actually go into a sub 1w mode with the fan end everything turned off.

For desktops. They don't put any caps on them at idle. They just have idle profiles. Which is basically 1 display > multiple displays > and sleep / hibernate. 

The max TDP through is monitored through the drivers. They'll pull clock speeds if it thinks you are going past whatever the max TDP for the card is + or - whatever your power tune settings are set to.

 

 



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 05/09/2014 07:49 AM
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Vegan
Elite

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modern video cards are increasingly being carved up into smaller chunks given what I see with NVIDIA cards any way.

all i know is that my budget is a tad limited so I tend to go hunt around ebay where there are good deals

 



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 05/13/2014 06:57 PM
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Vegan
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Looking at the AMD pages, they need to add more data to the page on specifications.

I would like to see video card power required, and PCI Express cable requirements.

My TX850V2 has 4 PCI Express cables and 70A of capacity so I do not care so much but not everyone has a Corsair datacenter grade power supply.

 



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 05/13/2014 07:02 PM
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black_zion
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The rule is (75w x #PCIe 6 pin) + (150w x #PCIe 8 pin) + 75w = Minimum power required. With the 295x2 we know that a card does not necessarily draw 75w from the PCIe slot and it can draw more than 75w. But then again AMD gives the TDP of every video card so you know what to expect.

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 05/14/2014 09:19 AM
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Vegan
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I saw one review with the same $20 power meter I use and the R9 295X2 is the current champion power pig at close to 500W for the card maxed.

So my TX850V2 will only permit, one such card.

Corsair has the AX1500i PSU, I like the model due to the 80 PLUS titanium rating and it has enough current for 2 such power pigs.

I noticed in eBay that the HD 5850 is now down to near $50 while the HD 6950 is now down near $100

both use a lot of power compared to the existing HD 5450

 



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Edited: 05/14/2014 at 09:27 AM by Vegan
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