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Dual Graphics card

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  • Graphics Cards
  • Crossfire
Last response: in General UK & Ireland Discussions
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March 7, 2013 2:13:55 PM

Hey Guys, So I am building a budget build gaming PC and hoping to upgrade, Unlike other people I do not believe in wasting parts.

What are the rules on crossfire X
I am having the radeon 7750 for a first card - http://www.scan.co.uk/products/2gb-gigabyte-radeon-hd-7...

And the second card will be a 7850 - http://www.scan.co.uk/products/2gb-xfx-radeon-hd-7850-c...

Or most likely: The 7870
http://www.scan.co.uk/products/2gb-xfx-radeon-hd-7850-c...


If I am wrong can you give me some Idea's of a good second card that will work with crossfire X

More about : dual graphics card

a b U Graphics card
March 7, 2013 2:22:14 PM

The rules of crossfire, and SLi, are simple.

The models must match i.e. you can only pair a 7750 with a 7750, you cannot pair a 7770 with it.
Everything else is fair game e.g. memory sizes/speeds, shader clocks, core clocks. The drivers maintain compatability by running both card at the memory sizes and clocks speeds of whichever card has the lower settings e.g. if card 1 has 1GB vram and card 2 has 2GB vram then it will run card 2 as if it had 1GB vram.

Apart from anything, for the sort of crossfire you're looking at the 7750 would hinder the 7850 so much you're better to run the 7850 by itself.
March 7, 2013 2:23:11 PM

So I can not pair them both together?
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a b U Graphics card
March 7, 2013 2:27:57 PM

No

The drivers won't allow it and the 7850 by would be crippled by lack of performance ny the 7750. I'm not 100% but I don't think the 7750 even has a crossfire connector.
a c 273 U Graphics card
June 25, 2013 3:17:24 PM

pauls3743 said:
The rules of crossfire, and SLi, are simple.

The models must match i.e. you can only pair a 7750 with a 7750, you cannot pair a 7770 with it.
Everything else is fair game e.g. memory sizes/speeds, shader clocks, core clocks. The drivers maintain compatability by running both card at the memory sizes and clocks speeds of whichever card has the lower settings e.g. if card 1 has 1GB vram and card 2 has 2GB vram then it will run card 2 as if it had 1GB vram.

Apart from anything, for the sort of crossfire you're looking at the 7750 would hinder the 7850 so much you're better to run the 7850 by itself.


Wrong! In Xfire you can pair a 7750 with a 7770 but you can't pair a 77xx card with a 78xx card.
!