Samsung Electronics has started mass production of smaller, denser DRAM that will help customers build thinner and lighter smartphones, tablets, and other mobile devices, while also improving battery life. The 4 GB, low power double-data-rate 2 (LPDDR2) DRAM is available to device manufacturers. DRAM is the system memory used in running the device's operating system and applications. Samsung has managed to boost speed of its DRAM, while reducing size and energy use, by shrinking the size of the circuitry to 30 nanometers from 40 nm in the older technology. The latest product has double the memory and data transmission speed. The latter has been bumped to 1 Gbps.