crossfire pci16 and pci16x4

I have a p5k delux wireless AP crossfire
q6600 oc 3.0ghz
2gig 6400 800
1 3870 visionTECK

I have asked but no one seems to know but my motherboard has 1 pci at 16x and when the board is crossfire
the second pci 16 only runs at 4x so will it even be worth running a second card in cross fire need to know
so I don't waste my money want to be able to play any game at 30 frames or more maybe play ( CRYSIS )at
high setting but that maybe pushing it , small note this is my first pc build and just starting to move to pc gaming
mostly gamed on consoles so any help would be great THANKS

It did not answer my question but it was a great read I got a lot of good info from it so thanks for your help

yay, another useless review. when are people going to go into depth about why we need the bandwidth rather than just observing what happens when you change the amount.

oh and the OP should have just bumped his original thread rather than starting a new one.

the basic answer is this, there is to my knowledge, no tech site that understands the reasons behind bandwidth usage or at the very least willing to do a proper test and explanation of it. so if the people's who's jobs it is to know about this stuff don't know, what do you expect to find on these forums?

you would best try to ask this question on a forum frequented by game dev's as they would be the ones to know what sort of data output games produce.

bit of a bitch then ain't it.