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Crossfire Radeon HD - Page 2

post #11 of 17
Quote:
Originally Posted by L337Something;12230813 
So the conclusion of this thread is that Indeed the Radeon 4890s only require one crossfire "pigtail" to connect to both cards and the extra connection ports are available upon doing tri/quad crossfire.

Yes. Pretty much
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post #12 of 17
Thread Starter 
So this thread hasnt finished. because AMDs website specifically says use 2 crossfire cables? 4890s are connected via 1 crossfire cable and my crossfire options come up in CCC but its greyed out. I have 11.1 catalyst download and steam says my video drivers are up to date.
    
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post #13 of 17
Thread Starter 
LoL yes i finally got it fixed. If ANYONE has greyed out issues on enabling 2nd gpu in crossfire... UNINSTALL all ccc products
maybe even two or 3 times.. get rid of everything. than re install a fresh 11.1 good day!!!
    
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post #14 of 17
I only use 1 CrossfireX bridge too, as others have said, the second bridge is used to connect a 3rd card and so forth.

I am happy i didn't fall for the Sandy Bridge hype MY CrossfireX is 16x + 16x! Each card runs at 16x (16GB transfer rate) Not the crippled max 8x (8GB transfer rate) that each PCIe GPU is STUCK with in a Sandy Bridge chipset!
post #15 of 17
^^Dude the difference is 2% between 16x and 8x.

When I had 2 4890s, it would crash using one bridge so I was forced to use 2.
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post #16 of 17
Quote:
Originally Posted by tsm106 View Post
^^Dude the difference is 2% between 16x and 8x...
Whatever helps you sleep at night.
post #17 of 17
Actually, the differnece is really minimal.
Just today I started running 5770's in crossfire, and I'm running a 16x slot and a 4x slot.
My numbers and benches are in line with expectations, about a 4% loss as compared to dual 16x.
PCIe2.0 isn't the same as 1.0, and todays cards just don't properly utilize the bandwidth that 16x offers yet.
If it helps you sleep at night to justify your mobo investment, I guess that's cool too.
http://www.techpowerup.com/reviews/A...caling/25.html
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