Apple 661-2659 512MB DDR-266MHz UDIMM 2Rx8 CL2.5 Memory

Product Description

The Apple 661-2659 is a 512MB DDR SDRAM memory module, specifically intended for use in compatible Apple Macintosh computers from an era when DDR memory was standard. Operating at a speed of 266MHz, which corresponds to the PC2100 standard, this module provides the necessary memory for the operating system and applications to function. DDR (Double Data Rate) technology allows for data transfer on both the rising and falling edges of the clock signal, effectively doubling the data rate compared to older SDR SDRAM. This module is configured as a 2Rx8 UDIMM, meaning it is dual-rank with eight memory chips per rank. The dual-rank design can offer performance advantages in certain system architectures by allowing the memory controller to interleave access between ranks. The CAS Latency (CL) is rated at 2.5, indicating a relatively low delay between the memory controller's request and the data being available from the memory module. This low latency, combined with the 266MHz speed, ensures efficient data access for the system. As a non-ECC (Non-Error-Correcting Code) Unbuffered DIMM (UDIMM), this memory is suitable for standard desktop applications. Its primary purpose is to provide the foundational memory required for the system to boot and run basic software. For users maintaining or upgrading older Apple hardware, this 512MB module serves as a crucial component for ensuring system stability and functionality, though its capacity is modest by modern standards.