Synchronous dynamic random-access memory is any DRAM where the operation of its external pin interface is coordinated by an externally supplied clock signal.
SDRAM memory modules
SDRAM memory module, enlarged
The 64 MB of sound memory on the Sound Blaster X-Fi Fatality Pro sound card is built from 2 Micron 48LC32M8A2 SDRAM chips. They run at 133 MHz (7.5 ns clock period) and have 8-bit wide data buses.
DIMM: 168 pins and two notches
DDR SDRAM
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Double data rate synchronous dynamic random-access memory is a type of synchronous dynamic random-access memory widely used in computers and other electronic devices. It improves on earlier SDRAM tech
Synchronous dynamic random-access memory
…come from its ability to interleave operations to multiple banks of memory, thereby increasing effective bandwidth. Double data rate SDRAM, known as DDR SDRAM, was first demonstrated by Samsung in 1997. Samsung released the first commercial DDR SDRAM chip (64 Mbit) in June 1998, followed soon after by Hyundai…
Front and back of a 1GB DDR SDRAM module for desktop PCs (DIMM)
Four DDR RAM slots
Corsair DDR-400 memory with heat spreaders