LGA 1155 processors on LGA 1156

Some LGA 1156 motherboards allows to upgrade to LGA 1155 processors. Motherboards with an LGA 1155 Ready label meaning motherboard can upgraded to LGA 1155 processors. However. not every motherboards can upgraded to LGA 1155 and LGA 1155/1156 processors are not compatible with LGA 1156/1155 motherboards because had difference Socket notches but LGA 1156 coolers are compatible with LGA 1155.

Example
Asus Maximus III with Core i7-2600 (originally Core i7-870)
8GB DDR3-1866 Memory
500GB Hard Drive + 250GB PCI Express SSD
GeForce GTX 580 SLI



Asus Maximus III Formula (Picture from HEXUS.net)