HD4850 crossfire question

[naknakkus]

I have a Powercolor PCS 4850 512mb at stock clocks. I intend to crossfire it at some point (when the single card doesn't cut it anymore).

Do I have to use the same model of card?
If I use a different card, does the faster card scale down to equal the slower one?

Thanks.

 

[CreAtiv3]

Do I have to use the same model of card?
No

If I use a different card, does the faster card scale down to equal the slower one?
Yes

 

[reflux]

Any card of the same model will work. Same as SLi.

 

[naknakkus]

Thanks!

 

[HeX]

ATi cards don't scale down to the slower one, they can both run independent clocks.

 

[naknakkus]

How does that affect performance? I know that the scaling is never linear, but is there a predictable average between the cards?

Could be interesting if I wait for the new Radeons later in the year...

 

[muppetkiller]

ATi cards don't scale down to the slower one, they can both run independent clocks.

Did not know that. I also dont think i would miss match video cards. Like have one 4850 + one 4870. I wonder how they would scale together. Or would you get more FPS using a 4850+4870 set up then just a 4850+4850 setup.

 

[naknakkus]

Try it out for my benefit?

edit: I misread your post and thought that you had both a 4850 and a 4870.