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How does crossfire work?

post #1 of 22
Thread Starter 
After being told the NF980-G65 was not available and considering how little selection of AMD>NVIDIA boards there are, i accepted the offer to recive the 790FX-GD70.

I will be using my GTX 260 for a bit but plan to *hopefuly* upgrade to a 5870. I was just wondering if someone can school me about how Crossfire x works as i am clueless/a newbie into the world of ATI. I was pretty much stumped on how id be able to use the 4 PCI-E slots, can i crossfire different cards unlike sli?

Iv also heard you can SLI on any board though a hack? How effective is this/can it be done with every board? Anyone have any info on this can you please tell me .

Thanks guys, Looking at reviews im actually glad im moving away from n force boards as this should offer me much more, just have to get the crossfire thing soreted out in my head .

+Rep for help
Edited by Rian - 3/10/10 at 11:58am
   
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post #2 of 22
CrossfireX is using 2 or more GPU together, similar to SLI. They too, like SLI, uses a bridge to connect the cards to enable CFX. And 5970 is 2 GPU and came crossfired. You can crossfire different cards, but it'll be a performance hit since it'll force them to perform on the clock of the slowest card. The recommended CFX cards for your future 5970 would be another 5970 or a 5870, provided that you clock the 5970 to at least 5870 speed.
As for the SLI on any board hack, I think there was a post floating somewhere I saw recently on OCN regarding that.
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post #3 of 22
Thread Starter 
Quote:
Originally Posted by WingedCow View Post
CrossfireX is using 2 or more GPU together, similar to SLI. They too, like SLI, uses a bridge to connect the cards to enable CFX. And 5970 is 2 GPU and came crossfired. You can crossfire different cards, but it'll be a performance hit since it'll force them to perform on the clock of the slowest card. The recommended CFX cards for your future 5970 would be another 5970 or a 5870, provided that you clock the 5970 to at least 5870 speed.
As for the SLI on any board hack, I think there was a post floating somewhere I saw recently on OCN regarding that.
Sorry my bad, i meant 5870, Still learning . Im looking intot he sli hack now. Thanks and +Rep.
   
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post #4 of 22
No prob. 5970 is basically the same as 2x 5870, just slightly lower clocked. But it can easily reach 5870 clocks, so I dont think it'll be a problem either way. The board is for CFX, so just slap ATI cards in and put the bridge on and you're good to go.
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post #5 of 22
2 or more card of the same series for example:
48xx together, 57xx together or 58xx together, eg. you can not do a 57xx and 58xx.

Just put the cards in there slap the bridge on, install drivers, and show us some sexy pics and benchies
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post #6 of 22
Thread Starter 
Quote:
Originally Posted by Hy3RiD View Post
2 or more card of the same series for example:
48xx together, 57xx together or 58xx together, eg. you can not do a 57xx and 58xx.

Just put the cards in there slap the bridge on, install drivers, and show us some sexy pics and benchies
This helped ALOT, so if i was to crossfire a.... 5870 and a 5850, would the 5870's clocks be dropped therfore being pointless or do they work in harmony together?
   
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post #7 of 22
If you have money to get a 5870 and 5850...why not just get a 5970? =p
But 5870+5850 will drop the speed to the lower card, 5850.
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post #8 of 22
Thread Starter 
Quote:
Originally Posted by WingedCow View Post
If you have money to get a 5870 and 5850...why not just get a 5970? =p
But 5870+5850 will drop the speed to the lower card, 5850.
No im just asking as an example, im a 14yo kid, i dont have that kinda money, im just relying on the birthday thats fast approaching xD.
   
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post #9 of 22
This is also true with RAM - for whatever reason if you have cards with 512 Mb and 1 Gb, it'll be as if you have two cards with 512 Mb.
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post #10 of 22
I don't think the cards down clock to each other in 5k series, or did I dream that?
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