This is an inexpensive way to add a Quad Core Processor to the 775 board.
Also 775 boards will have overclocking abilities allowing you the speeds of the more expensive Core2Quad processors. 

A very important thing before proceed with this mod, is to ensure that TDP & FSB of your motherboard must equal or higher than your CPU. 

Some LGA775 motherboard chipsets are incompatible or have limitations with the detection of Xeon processors.