ddr3

DDR3 is a synchronous DRAM generation that followed DDR2. It retains dynamic charge storage and double-data-rate signaling while changing internal organization and interface requirements. Capacity, speed grade, package, and module configuration remain separate specifications. The generation name alone does not identify the amount of installed memory.

An 8n prefetch organization supports a faster external interface relative to internal array access. Samsung’s comparison identifies eight-bit prefetch for DDR3 versus four-bit for DDR2. Data is organized internally into groups that feed successive interface transfers. The bank and command timing still determine when useful bursts can begin.

A simple bandwidth calculation makes the transfer-rate unit concrete. DDR3-1600 denotes 1600 million transfers per second per data pin. Across an illustrative 64-bit data path, that corresponds to 1600 million × 8 bytes = 12.8 GB/s of ideal raw bandwidth. Actual throughput depends on scheduling, row locality, refresh, and other system costs.

Supply requirements differ across the family’s variants. Standard DDR3 commonly uses 1.5 V, while DDR3L is associated with 1.35 V operation under its defined support conditions. Module and controller specifications determine the permitted combination. The fact that two products carry related DDR3 labels does not establish every voltage or platform compatibility detail.

Application performance depends on more than peak transfer rate. A higher transfer rate can coexist with different cycle-count latency, so elapsed access time must be calculated from the actual timing. Channels, ranks, bank behavior, and controller policy affect the result. DDR3 is best evaluated as a complete memory subsystem serving a known workload.

Sources and further reading. [Samsung DDR2 and DDR3 comparison](https://semiconductor.samsung.com/dram/ddr/ddr3/); [Intel DDR3 voltage documentation](https://www.intel.com/content/www/us/en/support/articles/000007106/boards-and-kits/desktop-boards.html).

Read DDR3 SDRAM as a DRAM interface generation whose practical performance comes from timing, organization, and controller scheduling.