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What is the difference between SPD and PPD?

April 26, 2017PPD SPD

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What is the difference between SPD and PPD?

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When a computer system boots up, it needs to “detect” the configuration of the memory modules in order to run properly. PPD (Parallel Presence Detect) is the more traditional method of using a number of resistors to relay the required information, and SPD (Serial Presence Detect), a more recent method, uses an EPROM to store information about the module. SPD can store over 400 times as much information as PPD, and is becoming more prevalent.