crossfiring different brands safe?

I currently have a HD4870 512mb by Sapphire. I'd like to crossfire with another one, but a different brand. (i don't know which one yet). Is it safe to do so? or will it be error-prone?

 

by brand, I mean brand name

 

No, you should be fine, just make sure you get another card with very similar specs, and you will have no problems!

 

As long as the 2 cards have the same chip with the same amount of RAM and the same clock speeds, you will be fine.

If there is a discrepancy, it is likely that the rig will function, but the faster parts of the card will clock down to the slower speed of the other card.

 

ok thx

 

Just out of curiosity, did you crossfire the cards?

If so, how much of a performance increase are you seeing?

 

I haven't purchased the other card yet. As soon as I do, i'll let you guys know

 

hi, I just crossfired the cards. one Sapphire 4870 512, and one XFX 4870 1gig.

I only tried 3 games yet. max graphics, 1920x1200
Fallout 3: before: 35 - after: 45
Operation Flashpoint Dragon Rising: before: 13 - after: 18
crysis: before: 28 - after: 54