What's the difference between Z68, Z77 and Z78?

[internetswag]

I have a Z68 motherboard and would like to know the difference, is Z77 and Z78 better? If so why and how is it different to each other?

 

[abekl]

The z77 and z78 are not really better than the Z68, just newer and with a few more features. The Z68 chipset is still considered a good enthusiast chipset.