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IBM FC4490 1GB DDR-266MHz RDIMM 1Rx4 CL2.5 Memory
- Capacity: 1GB
- Type: DDR SDRAM
- Speed: 266MHz (PC2100R)
- Form Factor: RDIMM (Registered DIMM)
- Rank: 1Rx4 (1 Rank, 4 bits per rank)
- CAS Latency: CL2.5
- Voltage: 2.5V
- ECC: Yes (Error-Correcting Code)
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Product Overview
This IBM 1GB RDIMM memory module operates at DDR-266MHz with a CAS Latency of 2.5. It features a 1-rank x 4-bit organization, designed for older server systems requiring ECC support.
Technical Information
| Brand | IBM |
| Part Number | FC4490 |
| Capacity | 1GB |
| Memory Type | DDR SDRAM |
| Speed | 266MHz |
Additional Specifications
| Form Factor | RDIMM |
| Rank | 1Rx4 |
| CAS Latency | CL2.5 |
| ECC | Registered ECC |
Product Description
The IBM FC4490 is a 1GB Registered DIMM (RDIMM) module designed for older generation servers and workstations that utilize DDR SDRAM. It operates at a speed of 266MHz, also known as PC2100R. RDIMMs incorporate a register chip that buffers the command and address signals, reducing the electrical load on the memory controller. This allows for greater memory capacity and improved system stability, which was particularly important in the server architectures of the era when this memory was prevalent. This module features a 1-rank x 4-bit (1Rx4) configuration. A single rank means there is one set of memory chips on the module, and each chip is organized with 4 bits of data per bank. This configuration is typical for lower-density DDR modules. The CAS Latency (CL) is 2.5, indicating a very fast response time in terms of clock cycles required to access data. This low latency, combined with the 266MHz speed, was considered efficient for the computing needs of its time. Supporting ECC (Error-Correcting Code), the FC4490 is capable of detecting and correcting single-bit errors, which is crucial for maintaining data integrity in server environments. It operates at a voltage of 2.5V, which is standard for DDR SDRAM. This IBM RDIMM is suitable for upgrading or replacing memory in legacy IBM servers and other systems that specifically require DDR-266MHz RDIMMs with ECC support.
