Short for serial presence detect
, a category of information that is stored in an EEPROM chip
on a memory module
and communicated to the BIOS
when the computer is booted
. The SPD tells the BIOS the module s data, such as its size, data width, manufacturer, speed, row and column addresses and voltage. With the information the BIOS can configure the memory controller to maximize performance and to reduce the chances of performance failures.