LGA 1155 Ivy Bridge
LGA 1150 Haswell
LGA 1150 is Newer and supports the 4th generation of i5's and i7's
LGA 1155 is the older of the two and is designed for the 3rd generation
LGA(land grid array) is how many contacts there are on an intel processor. The difference between the two is 5 little contacts.
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