Question: What does SPD stand for and what does it do?

Read our answer below:

Whenever you see SPD referred to in conjunction with a computer memory module it stands for Serial Presence Detect and is small amount of grouped data stored on the module to assist its detection and configuration once a system is turned on. SPD was first introduced when SDRAM came into use (circa 1996) replacing the older and less extensive PPD (Parallel Presence Detect) specification.


The laptop memory modules you insert into your laptop in the form of SODIMM's being the full technical name must be detected by your system and properly configured before they can be used. In order to do this, your laptop's BIOS reads the SPD data and compares it to the memory controller's capabilities prior to determining the best setup. In the case of installing two or more SODIMM's with varying frequencies, this process will also result in your system running at the speed of the slower SODIMM(s) so as to not cause instability. A BIOS that has been correctly implemented will always endeavor to run the system's memory at the highest speed supported both by the SODIMM's installed and that of the present memory controller, regardless whether the latter is found in a separate chipset to the main processor, or part of the processor die itself.


SPD stores various data necessary in performing the above, this includes supported profiles, which in turn contain data relating to the supported frequency, timings and voltage. Additional data will include the manufacturer's name and module model number.


For best performance and the least potential for rare but nevertheless possible compatibility issues it is advised to buy your laptop memory upgrade at the same time thus consequently keeping all the modules you intend on installing identical.


Learn more about the technicalities behind laptop memory in part 2 of the Laptop Memory Upgrades Guide and/or the different types of laptop memory in part 3 of the Laptop Memory Upgrades Guide.


Would you be interested in viewing other technical laptop memory question topics and answers? If so simply click the button below and choose your desired topic by clicking its title.



Read the Laptop Memory Upgrades Guide to learn about all the aspects you should know when buying laptop memory...

...alternatively discover Where to buy 100% compatible SDRAM, DDR, DDR2 and DDR3 SODIMM memory.

PC2-5300 667MHz DDR2 200-pin SODIMM's

Looking for PC2-5300 667MHz DDR2 200-pin SODIMM's for your laptop? Select the memory upgrade you require below and buy without the hassle!


Need other laptop memory SODIMM's? Simply click a memory type below to view a full list of available SODIMM's...




Kingston laptop memoryCrucial laptop memoryCorsair laptop memoryOCZ Technology laptop memoryPNY laptop memoryHypertec laptop memory
laptop memory for HP laptopslaptop memory for Compaq laptopslaptop memory for Dell laptopslaptop memory for Acer laptopslaptop memory for Lenovo laptopslaptop memory for Toshiba laptopslaptop memory for Asus laptopslaptop memory for Fujitsu-Siemens laptopslaptop memory forFujitsu laptopslaptop memory for Sony laptopslaptop memory for Samsung laptopslaptop memory for Packard Bell laptopslaptop memory for Gateway laptopslaptop memory for Apple laptopslaptop memory for Advent laptopslaptop memory for Medion laptopslaptop memory for MSI laptopslaptop memory for Vobis laptopslaptop memory for Hi-Grade laptopslaptop memory for Alienware laptopslaptop memory for Voodoo laptops
Buy laptop memory at CrucialBuy laptop memory at OfftekBuy laptop memory at MyMemoryBuy laptop memory at NovatechBuy laptop memory at EbuyerBuy laptop memory at Micro DirectBuy laptop memory at DabsBuy laptop memory at SaverstoreBuy laptop memory at PC WorldBuy laptop memory at PC World BusinessBuy laptop memory at PIXmaniaBuy laptop memory at InsightBuy laptop memory at MaplinBuy laptop memory at OyyyBuy laptop memory at MiscoBuy laptop memory at BT Business DirectBuy laptop memory at BT ShopBuy laptop memory at PlayBuy laptop memory at KelkooBuy laptop memory at Zavvi
Copyright © 2009 - 2017 Laptop Memory Upgrades UK - All rights reserved.