Yes it works.
We have plga775 which is plastic land grid array 775
We have fclga1155 that is flip chip land grid array 1155.
Differences in flip chip is that :http://en.wikipedia.org/wiki/Flip_chip
Processing a flip chip is similar to conventional IC fabrication, with a few additional steps. Near the end of the manufacturing process, the attachment pads are metalized to make them more receptive to solder. This typically consists of several treatments. A small dot of solder is then deposited on each metalized pad. The chips are then cut out of the wafer as normal.
Yes it is work.But however according to some the bios wont recognize it however it would work.