The Samsung 512MB 1Rx8 PC2-5300U-555-12-D3 M378T6553CZ3-CE6 memory set includes two 512MB modules, providing a total capacity of 1GB. These RAM modules are designed by Samsung, a reputable brand known for their high-quality computer components. With a bus speed of PC2-5300U, these memory modules are ideal for improving the performance and efficiency of computers in need of additional memory capacity. Made in Korea, Republic of, these memory modules are a reliable option for those looking to upgrade their system's memory capacity.