Pull up your rocking chairs and dust off your brandy glasses we are about to tell a story you may not believe. Back in the early days of computer hardware everything was an expansion card. For instance if you wanted to run a hard drive you needed a controller card. Sound cards were actually cards and modems were often external and knowing this which made your choice in motherboard fairly important as you needed room for it all. As technology progressed so did the onboard options. For instance IDE controllers were now part of the chipset but RAID was still done with a specialized controller that is, until it was added onboard too.