The CT51264BA1339.16F.D is a high-performance DDR3 memory module from Crucial. Designed for desktop computers, this module has a total capacity of 4GB, operating at a speed of 1066MHz (PC3-8500). The module utilizes a 240-pin configuration for connectivity, ensuring compatibility with a wide range of DDR3 compatible motherboards. This Unbuffered DIMM (UDIMM) memory module is built using a 512Mx64 configuration, which implies a high density and reliable performance for everyday computing tasks as well as more demanding applications. Manufactured by Crucial, a brand known for quality and reliability, the CT51264BA1339.16F.D represents a cost-effective way to improve system performance or replace aging memory. It is perfect for users looking to upgrade their system's memory capacity, enhance multitasking capabilities, or increase the responsiveness of applications.