But at least People Know when Dealing with a AMD Socket that Most Socket 939 Motherboards can be a Drop-in Upgrade with the usual BIOS update. So like Enyden said if CPU is a Socket 939, it'll usually fit into a Socket 939 and work(not Dealing with 940 and AM2, Same Pins Different Name). But LGA775 ,You cannot take a Quad-Core Q6600- QX6700 and fit it into a Prescott Certified 925Chipset
you will have problems.
Just stating Chipset Problems(incompatibility) are more annoying than having to change Sockets, because it makes it easier for the simpleton upgrader.
Intel Makes it like this, If your child has one of these (bottom of Page)
It May fit, but the game is no good unless that wooden board supports the new Colours.
But AMD makes it so that it's a drop in fit(If it's a Square it should fit into the Square :?: ), usually doesn't even need a BIOS update, so it actually becomes as simple as it seems, Drop and Play