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2ND 7950 OR SINGLE 7970 - Page 4

post #31 of 51
Thread Starter 
Quote:
Originally Posted by Doc_Gonzo View Post

If you run two cards in crossfire, then you are limited in speed by the slowest card.
Someone can correct me if I'm wrong here but I think, with Boinc, you can have them un-linked and then each card would run at it's own speed and I don't think one would be limited by the other.
How are the noise levels at load with that XFX card? I was looking at that a week ago as it seemed a steal for £220!

At load it does get loud, but its not much louder than my old MSI 550TI
post #32 of 51
one 7970 has 2048 cores, 2x 7950 = 3584

Easy win !

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post #33 of 51
Quote:
Originally Posted by Doc_Gonzo View Post

If you run two cards in crossfire, then you are limited in speed by the slowest card.
Someone can correct me if I'm wrong here but I think, with Boinc, you can have them un-linked and then each card would run at it's own speed and I don't think one would be limited by the other.
How are the noise levels at load with that XFX card? I was looking at that a week ago as it seemed a steal for £220!

Doc's right on the $$$ re: crossfire. With BOINC, you can unlink the cards and each card can have its speed independently adjusted.
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post #34 of 51
Quote:
Originally Posted by Doc_Gonzo View Post

If you run two cards in crossfire, then you are limited in speed by the slowest card.
Someone can correct me if I'm wrong here but I think, with Boinc, you can have them un-linked and then each card would run at it's own speed and I don't think one would be limited by the other.
How are the noise levels at load with that XFX card? I was looking at that a week ago as it seemed a steal for £220!

Your also wrong on the crossfire i ran a 5970@890 and a 5870@950 works great just use msi ab to overclock each one and dont have the box checked to sync settings.
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post #35 of 51
Quote:
Originally Posted by Bal3Wolf View Post

Your also wrong on the crossfire i ran a 5970@890 and a 5870@950 works great just use msi ab to overclock each one and dont have the box checked to sync settings.

Thanks for the correction! I didn't realize that you could do that with AB. Does that only work well with Boinc or does it work fine when running games too?
 
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post #36 of 51
I'd be tempted to stay away from Coolermaster PSU's.... They're generally quite bad.
I'd suggest a Seasonic, Corsair or Silverstone's range.
 
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post #37 of 51
Quote:
Originally Posted by Doc_Gonzo View Post

Thanks for the correction! I didn't realize that you could do that with AB. Does that only work well with Boinc or does it work fine when running games too?

works with both i always kept my 5970@890/1200 and my 5870@949/1200 or 1000mhz/1300mhz ran games good but alot of heat from those cards thats the main reason i love my 7970 so much powerful and not alot of heat. You can even use ccc to overclock cards separtely in crossfire just pick each card with the drop down box.
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post #38 of 51
Quote:
Originally Posted by Bal3Wolf View Post

works with both i always kept my 5970@890/1200 and my 5870@949/1200 or 1000mhz/1300mhz ran games good but alot of heat from those cards thats the main reason i love my 7970 so much powerful and not alot of heat. You can even use ccc to overclock cards separtely in crossfire just pick each card with the drop down box.

Very useful info thanks. Just out of curiosity as I've never crossfired two cards of different speeds - when you initially plug them in and hook them up, is one card downclocked to match the other? and do you then just clock it back up using he method you described?
 
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post #39 of 51
Quote:
Originally Posted by Doc_Gonzo View Post

Very useful info thanks. Just out of curiosity as I've never crossfired two cards of different speeds - when you initially plug them in and hook them up, is one card downclocked to match the other? and do you then just clock it back up using he method you described?

Be default they're usually at different speeds yes, and the tickbox isn't selected. At least it wasn't for my with my 6870 + 6850.
You're better to run them at the same speed personally, as I got a lot less microstutter in games and less screen tearing. Though 2x 68xx's screen tearing can't really get much worse.

I'd suggest to run them at the same clocks, even if that does mean downclocking one card. You get much better overall visual performance.
 
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post #40 of 51
Quote:
Originally Posted by Doc_Gonzo View Post

Very useful info thanks. Just out of curiosity as I've never crossfired two cards of different speeds - when you initially plug them in and hook them up, is one card downclocked to match the other? and do you then just clock it back up using he method you described?

differt clocks and i didnt really have any micro stutter with my setup like the other guy but like most know crossfire does not always work well in games so thats why i like my single powerful gpu.
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