The Vintage SUN X7005A 512MB KIT consists of two 256MB DIMM modules with ECC memory capabilities. Designed for server use, this memory kit provides a total capacity of 512MB, with each module offering 256MB of memory. The ECC feature ensures error correction, making it a reliable choice for enterprise networking and server applications. Ideal for those looking to upgrade their server components, this product is a valuable addition to any computer system requiring high-quality RAM.