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DDR SDRAM
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Double Data Rate Synchronous Dynamic Random-Access Memory is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) class of memory integrated circuits used in computers. DDR SDRAM, also retroactively called DDR1 SDRAM, has been superseded by DDR2 SDRAM, DDR3 SDRAM, DDR4 SDRAM and DDR5 SDRAM. None of its successors are forward or backward compatible with DDR1 SDRAM, meaning DDR2, DDR3, DDR4 and DDR5 memory modules will not work on DDR1-equipped motherboards, and vice versa.
Front and back of a 1GB DDR-400 RAM module for desktop PCs (DIMM)
Front and back of a 1GB DDR-400 RAM module for desktop PCs (DIMM)
Four DDR RAM slots
Four DDR RAM slots
Corsair DDR-400 memory with heat spreaders
Corsair DDR-400 memory with heat spreaders
Synchronous dynamic random-access memory
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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 module
SDRAM memory module
SDRAM memory module, zoomed
SDRAM memory module, zoomed
The 64 MB of sound memory on the Sound Blaster X-Fi Fatality Pro sound card is built from two Micron 48LC32M8A2 SDRAM chips. They run at 133 MHz (7.5
The 64 MB of sound memory on the Sound Blaster X-Fi Fatality Pro sound card is built from two Micron 48LC32M8A2 SDRAM chips. They run at 133 MHz (7.5 ns clock period) and have 8-bit wide data buses.