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Be mindful the 5870 will be "brought down" to the 5850 speed.if you CF them together. It does not "balance".

And overall you'll then loose a little more performance as crossfire is never linear increases/gains as it appears crossfire backs off a bit more with two cards that are not identical.

plug them both in put all associated power cables on and add a crossfire bridge cable

crossfiebridgeas-sml.jpg<<Click

Got that but I'm trying to work out what needs to be plugged into the othe gfx card because I can't see the same plugs spare that are in the current gfx card

And what pin outs do you have over the 2 cards?

Without know the brand, its hard to tell. Diff brands of the same card can have different pinouts etc.

at the moment i have 2 6x pins into the one gfx card and when i went to install the other gfx i evened it out 1 6x pin and 1 2x pin into one gfx and same with the other, and when i went to turn it on

it was making a constant beeping sound and there was no display

ok took my pc to pc diy after work today, and they said my pci express slots are too close to each other so my gfx would over heat. so for now im just going to reformat the computer (fun) and hopefully it will speed it up abit, also got them to over clock it safely

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