Topic Title: When did AMD switch function of crossfire downclocking?
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Created On: 10/10/2013 10:43 AM
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 10/10/2013 10:43 AM
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Pierre3400
Peon

Posts: 3
Joined: 10/10/2013

Hey there,

I have searched high and low, but i have yet to find the answer.

Back in 2005 When Crossfire was new, it was said that running 2 GPU's at different clocks would improve performance, or at least see no loss.

E.g Running one card with 800mhz and the other with 900mhz.

These days, things are different.
When running e.g one 7970Ghz and one 7950 in crossfire, the 7970Ghz will downclock to match speed of the 7950.

This is covered in the AMD FAQ on Crossfire.
http://support.amd.com/en-us/kb-articles/Pages/AMDCrossFireFAQ.aspx#108

What I would like to know is, when was this feature first added to the AMD systems?   

I would like to have a full date, link to arctical or information about this change. Maybe which driver version this change was added into.

Regards,

Pierre Schou

 10/10/2013 02:39 PM
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black_zion
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Joined: 04/17/2008

It was a change AMD didn't tell us about implemented during the HD 5000 generation or late HD 4000 series generation. It's still not a recommended setup, but the faster GPU will not convert down to the slower GPU's specs like it used to.

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 10/10/2013 02:54 PM
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Marc@AMD
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PM sent to you, Pierre3400.  Thank you for linking the AMD CrossFire FAQ as one place where that's stated.  That will need to be ammended accordingly.

;Marc



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AMD Customer Care

The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions and typographical errors. Links to third party sites are for convenience only, and no endorsement is implied.

 10/10/2013 03:58 PM
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Pierre3400
Peon

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Joined: 10/10/2013

I do need to be 100% on this.

Late HD4000, HD5000 and HD6000 cards, when in crossfire they would run the clock of the lowest clocked card.

With HD7000 series, they will be able to gun the indiviual clock they have?

 

 10/10/2013 04:27 PM
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Marc@AMD
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With the Radeon HD7000 Series and newer products each graphics card in the CrossFire setup can run at its own, unique memory and GPU-core clock speeds.

;Marc



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AMD Customer Care

The information presented in this document is for informational purposes only and may contain technical inaccuracies, omissions and typographical errors. Links to third party sites are for convenience only, and no endorsement is implied.

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