The first one is a dual Opteron socket 940 motherboard. The GA-7A8DW :

The second one is a socket 754 one. The GA-K8NNXP which uses the Nvidia Crush chipset.

The third is the GA-K8VNXP, also a 754 pin socket motherboard which uses the Athlon 64 chipset from VIA.

Source : Akiba