Crossfire, different cards, same chip / manufacturer

[eyemaster]

Alright, I already have the MSI R4890 Cyclone OC Radeon HD 4890 1GB.

Do I need to buy the exact same card again or can I buy a different MSI R4890 card and put them in crossfire?

Like, can I mix these 2 together? Same specs...
http://www.msi.com/index.php?func=proddesc&maincat_no=130&cat2_no=137&prod_no=1786
http://www.msi.com/index.php?func=proddesc&maincat_no=130&cat2_no=137&prod_no=1849

 

[JofaMang]

You can crossfire these two cards. Any clock differences will be be fixed through auto downclocking of the faster card.

 

[eyemaster]

The more I'm reading, the more I'm seeing people are mixing cards. So I guess it's not that big a deal to mix up cards... correct?

 

[JofaMang]

Nope, not between brands of the same card, anyhow.