Can we have a crossfire with HD 4650 and HD 7850?

Can we have a crossfire with HD 4650 and HD 7850?

Please help. My friend is asking.

No they need to be in the same series because they have different chips.

BUT even if you could (which you can't) either card will lower down its speed to match the slowest cards performance. So in theory, your HD 7850 would become a HD 4650 in terms of performance :P

Cards in the same series can crossfire though.

It's quite complicated:

http://sites.amd.com/PublishingImage...hart_1618W.jpg

Thanks guys.