Sony VAIO L Series Desktop computers can take a maximum of 8 GB of memory. They contain 2 memory card slots, each of which can hold 4 GB of RAM. The type of RAM needed depends on the model of computer. The VPCL138FX/B, VPCL137FX/B, VPCL137FX/R and VPCL135FX/B use DDR2 RAM while the VPCL2190X CTO, VPCL21SFX/W, VPCL21BFX/B, VPCL21AFX/B, VPCL22DFX/B, VPCL2290X 2D/3D CTO, VPCL22CFX/B and VPCL22SFX/W use DDR3. DDR3 SDRAM transfers data twice as fast as DDR2 SDRAM, enabling higher peak data rates. DDR3 SDRAM is also more energy-efficient than its predecessor.