DDR (Double Data Rate SDRAM) is a DRAM technology that supports data transfers on both the rising and the falling edges of each clock cycle. This effectively doubles the memory chip’s data throughput and is more efficient than legacy SDR technology. PNY manufactures DDR memory upgrades rated at PC2100, PC2700, and PC3200. They are compatible with desktop and notebook computers and processors such as Intel’s Pentium, Celeron, AMD’s Athlon, Sempron and others. PNY upgrade modules are compatible with systems from Apple, Compaq, DELL, Gateway, HP, IBM and over 5000 other systems. Boost the performance of your PC to its maximum capability. PNY memory upgrades will prove to be an outstanding value both now and in the future.