Xfire - 2x8 vs 2x16.

How much of an increase is 2x16 over 2x8 in Xfire? I have the P5W DH Deluxe, which runs Xfire in 2x8. I already have a x2900XT slapped on it and was wondering it it would be worth it a couple months from now to slap in another one.

Thanks.

I am by no means an expert, but I believe you can only run crossfire with in 2x8 mode and 16x in single card configuration.

Can anyone else comment on this?

It will use 16x16 if it has it. Preformance wise probably not alot can commit on it yet since its new and people are just starting to mess with crossfire. If anything I'd say 5% at most of a hit.