Memory is available in a variety of sizes ranging from 1 GB sticks to 8 GB kits. Kits contain 2 memory sticks and divide the total memory size between the 2 available slots. The J Series uses DDR3 SDRAM, which transfers data twice as fast as its predecessor. The higher transfer rate enables higher peak data rates for faster performance. Due to a reduction in supply voltages, DDR3 uses 30 percent less power than earlier types of memory.