Memory is available in a variety of sizes, ranging from single 128 MB chips to 1 GB 2-piece kits. Sony VAIO PCG GRV Series laptops use PC2100 DDR SDRAM. The memory operates at a frequency of 266 MHz. The DDR technology allows for faster system performance through improved data retrieval rates. Laptops use SO-DIMM chips, which are half the size of traditional DIMMs. The smaller chips fit better in laptops without compromising performance or capacity. Laptops use non-registered, non-ECC, unbuffered RAM.