CF compatibility

[Alai]

Is HD4870 X2 compatible in CF with HD4870? Or must there be two HD 4870 X2?

Also, are there any things to consider when getting CF besides heat and PSU? (I was thinking 1kw Corsair PSU would be enough even for future OCing.)

 

[Rauelius]

Since you can CF a 4850/3870/3850 and a 4870 together, I think it's safe to assume you can CF a 4870X2 and a 4870.

 

[dhc014]

Yes, any HD48X0 series card can be Crossfired with any other HD48X0. I've even read reports of people Crossfiring an HD3870 with an HD4850.

 

[XpediencY]

I've even read reports of people Crossfiring an HD3870 with an HD4850.

I thought I saw somewhere that AMD officially said that you cannot crossfire different generation of cards. 4xxx with 4xxx and 3xxx with 3xxx only - No cross-generation.

Well here's a statement from Fud, but then again, no one likes fud, except me

http://www.fudzilla.com/index.php?option=com_content&task=view&id=8075&Itemid=65

 

[Frostex]

Does the 4870x2 act as 2 cards in crossfire when you add a 2nd card say a 4870, that would give you 3 cards and presumably each would do 1/3 of the work.

Or does it detect the 4870x2 as only 1 card and give it 1/2 the work load rather than 2/3's, which would obviously be a waste.

if it works the good way I may upgrade my 4870 crossfire setup to a 4870 and 4870x2, for Tri-Crossfire