Topic Title: HD 7890 and HD 5870 - Crossfire
Topic Summary: I can't make both run at crossfire.
Created On: 01/21/2013 12:24 PM
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 01/21/2013 12:24 PM
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hooLigans_
Peon

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Hi all,

I'm new here and I really don't have time to read the forum rules, I hope I'm not doing anything wrong.

Anyway, I have one HD 7890 and HD 5870 and I wanna Crossfire them...

Someone knows if thats possible or recommended ?

 

Thank you all and Best Regards,

Rodrigo Lemela Duarte 

 01/21/2013 12:41 PM
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spyre
Heavy Wizardry

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You cannot.

 01/21/2013 12:46 PM
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hooLigans_
Peon

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Are you sure ?

 01/21/2013 12:50 PM
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Mime
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Yep... Not going to happen dude...

It probably wouldn't work very well even if you could.



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 01/21/2013 12:55 PM
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hooLigans_
Peon

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Damn...

Ok, thx for the reply...

Just to be sure, 7890 > 5870, right ?

Best regards,

Rodrigo 

 01/21/2013 12:59 PM
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Mime
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Yep... by a lot, although it's hard to tell with the whacko model numbers everyone uses these days.

Keep the 7890, and either sell the 5870, or put it in another rig.  It can still hold it's own most of the time... it just isn't as fast as the 7890.



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 01/21/2013 01:38 PM
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hooLigans_
Peon

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Mime,

Thanks a lot for your answer...

I will sell my 5870 and get another one.

 

Thank you and Best Regards,

Rodrigo

 01/21/2013 02:03 PM
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black_zion
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http://en.wikipedia.org/wiki/C...hics_processing_units

HD 5870 - 2720 GFLOPS SP power
HD 7890 (7870 XT) - 2841.6 - 2995.2 GFLOPS SP power

So roughly the same on-paper power, but GCN is more efficient than VLIW5.

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 01/21/2013 02:24 PM
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Mime
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MIPS = Meaningless Indication of Processor Speed. 

MIPS and FLOPS have a long and terrible history of being misused since it's often extremely difficult to get a meaningful comparison across different systems.  That's just one example.  Two chips can have very similar values for MIPS or FLOPS, and yet one can beat the pants off of another.

Partially in response to that, the linux kernel computes a measure called "BogoMips" at every boot.  It's often defined as the number of million times per second a processor can do absolutely nothing.  Figuring out how many bogoMips a chip is capable of actually does have a real purpose, but as a user you can't actually use it for anything.



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 01/21/2013 05:16 PM
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black_zion
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Better than taking two cards and running them through, say, Haven or 3DMark. Measuring the FLOPS capabilities is an at-a-glance quick comparison of the power of the cards the same way Linpack does for HPC systems. How programs put that power to use, however, varies considerably as we all know.

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 01/21/2013 05:35 PM
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Mime
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All benchmarks suck, in one way or another.  Some suck more than others.

The thing is... running "programs" is what hardware is designed to do.  Running away into an ivory tower and cooking up magic numbers... not so much. 



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 01/23/2013 07:50 PM
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bugfire
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AMD has a chart on there website for crossfire compatabilty. Pretty simple though,first 2 numbers should be the same looks like.

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