Eyfinity setup

[opticlunch]

i'm currently building a system and i my stepfather has given me two old monitors (4:3 and only vga from 2005)
then im wondering if i buy the gigabyte radeon hd 6950 and an asus VE276Q 16:9 (got displayport). can i set my asus in the middle conected with displayport and the two 4:3 screens on each side of it and use eyefinity?

 

[opticlunch]

also im using an asus m5a97 motherboard with pciE2.0. could i get problems with the radeon hd 6950 since it has pciE 2.1?

 

[opticlunch]

can i use 2 different graphics card with crossfireX together?