Z77 chipset is LGA 1155, mainly for Ivy Bridge cpus, but it also has backward compatibility with Sandy Bridge cpus. It has dual-channel memory architecture and is commonly used in consumer-level computers, although newer computers often use its successor Z87 for Haswell cpus.
X79 chipset is LGA 2011, for Sandy Bridge-E and Ivy Bridge-E. It has quad-channel memory architecture, plus the cpus for it can have more cores (up to 6c/12t for desktop and up to 12c/24t for server), and computers using it are often considered workstation-class computers.