ELPIDA MC-4R256FKE8D-845 Rdram Ecc Rimm Memory Module 256MB 184-PIN 800.45MHZ

( Brand: Elpida ), ( Manufacturer Part Number: MC-4R256FKE8D-845 ), ( Form Factor: Rimm ), ( Type: Rdram Ecc ), ( Total Capacity: 256 Mb ), ( Number Of Pins: 184 ), ( Bus Speed: 800.45 ), ( Memory Features: Ecc Memory )

Review ELPIDA Rdram Ecc Rimm 256mb 184-pin 800.45mhz Memory Module

The **Elpida MC-4R256FKE8D-845** is a high-performance **256MB DDR2 RD-RAM (Registered Dual In-Line Memory Module)** designed for demanding server, workstation, and enterprise computing environments where reliability, speed, and capacity are critical. Engineered with **ECC (Error-Correcting Code) technology**, this memory module ensures data integrity by detecting and correcting single-bit errors on the fly, making it an ideal choice for applications requiring fault tolerance, such as database management systems, virtualization platforms, and high-performance computing clusters. The **184-pin DIMM form factor** adheres to industry-standard specifications, ensuring seamless compatibility with a wide range of motherboards and server chassis, particularly those supporting **DDR2 memory architectures**.

Operating at a **clock speed of 450MHz (effectively 800.45MHz data transfer rate)**, this module delivers robust performance with a **PC2-7200 (DDR2-900) rated speed**, enabling faster data processing, reduced latency, and improved system responsiveness. The **RD-RAM (Registered DIMM) configuration** incorporates a **register chip** between the memory module and the motherboard, which helps mitigate signal integrity issues on longer memory buses, a common challenge in high-channel-count server systems. This design not only enhances stability but also allows for the use of higher memory capacities per channel without compromising performance.

Built with **Elpida s advanced memory technology**, this module incorporates **low-power, high-density DRAM chips** to maximize efficiency while maintaining peak performance. The **256MB capacity** provides a balanced solution for mid-range servers, workstations, or systems requiring additional memory without the need for multiple modules. Whether deployed in **RAID configurations, virtualization environments, or high-end desktop setups**, this memory module ensures consistent and reliable operation, reducing the risk of data corruption and system crashes. Its robust construction and adherence to strict manufacturing standards make it a dependable component for professionals who demand both performance and durability in their computing infrastructure.

### **Pros and Cons of buying a ELPIDA MC-4R256FKE8D-845 RD-RAM ECC RIMM 256MB Module**

1. **Compatibility with Older Systems** This is a **RIMM (Rambus Inline Memory Module)**, designed specifically for **Rambus DRAM (RD-RAM)** systems, which were common in high-end workstations and servers from the late 1990s to early 2000s (e.g., Compaq Alpha, SGI Origin, some Intel Xeon platforms). If you have a legacy system requiring RD-RAM, this module will work.

2. **ECC (Error-Correcting Code) Support** The module includes **ECC**, which helps prevent data corruption by detecting and correcting single-bit errors. This is useful in **server or mission-critical applications** where data integrity is essential.

3. **High Performance for Its Era** Operating at **800 MHz (450 MHz effective data rate)**, this module was relatively fast for its time, providing better performance than standard SDRAM in Rambus-based systems.

4. **Reliability in Legacy Hardware** If you have a **Rambus-based system** that requires RD-RAM, this module is a direct drop-in replacement, avoiding the need for expensive or difficult-to-find alternatives.

5. **Low Power Consumption (Relative to Its Time)** RD-RAM was designed for efficiency in high-performance systems, though modern standards would still consider it power-hungry by today s metrics.

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1. **Extremely Obsolete Technology** RD-RAM was **discontinued in the mid-2000s** and is no longer manufactured or supported. Finding replacements is difficult, and compatibility issues may arise with newer BIOS/firmware.

2. **High Cost Relative to Modern Memory** Since this is a **specialized, discontinued module**, it is likely **expensive** compared to modern DDR/DDR4/DDR5 memory. For most modern systems, this is **completely unnecessary**.

3. **Limited Availability & Lead Times** Even if available, stock may be **low**, and shipping times could be long due to low demand.

4. **No Upgrade Path** Modern systems use **DDR, DDR2, DDR3, DDR4, or DDR5**, and RD-RAM is **incompatible** with any contemporary hardware. Attempting to use it in a modern system will **not work**.

5. **Potential Compatibility Issues** Even in legacy systems, **firmware or BIOS updates** may no longer be available, and some RD-RAM modules can be **fussy about matching speeds or manufacturers**.

6. **No Future-Proofing** If you're considering this for **archival or retro computing**, modern storage solutions (SSDs, cloud backups) are far more practical than relying on a **20-year-old memory standard**.

7. **Physical & Electrical Compatibility Risks** Some RD-RAM systems required **specific voltage levels or cooling**, and using mismatched modules could lead to **instability or hardware damage**.

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### **Conclusion & Recommendation**

This **ELPIDA MC-4R256FKE8D-845 RD-RAM ECC RIMM module** is **only useful for restoring or maintaining a specific, high-end legacy system from the late 1990s to early 2000s** that **explicitly requires Rambus DRAM**. For **any modern or general-purpose use**, this module is **completely irrelevant and impractical**.

- You have a **working Rambus-based system** (e.g., Compaq AlphaServer, SGI Origin, some early Intel Xeon workstations) that **requires RD-RAM for operation**.

- You are **preserving or repairing a rare, high-performance legacy machine** where no modern alternative exists.

- You have **verified compatibility** with your exact system model and are prepared for potential firmware limitations.

- You are **building or upgrading a modern PC** (any system post-2000s will not support RD-RAM).

- You are looking for **cost-effective memory** modern DDR4/DDR5 modules offer **far more capacity and performance** at a fraction of the cost.

- You are **not an enthusiast or professional** working with legacy hardware this is a **niche, high-risk purchase** with no practical benefits outside of very specific use cases.

- **If you have a confirmed need for RD-RAM in a legacy system**, proceed with caution, ensuring you have **exact compatibility** and **no better alternatives**.

- **For all other cases**, this module is **not worth considering**. Modern memory solutions are **far superior** in terms of **price, performance, and availability**.

If you are unsure whether your system actually requires RD-RAM, **double-check documentation** many older systems could use **standard SDRAM or DDR** instead. If you're dealing with a **modern system**, this purchase will **not work** and may even **damage your hardware** if attempted.

Details:

Elpida RDRAM ECC RIMM 256MB 184-Pin 800.45MHz Memory Module MC-4R256FKE8D-845.

part #: mc4r256fke8d845 prices

• $13.99-$39.00

specifications servermemor:

• brand: Elpida
• mpn: Mc-4r256fke8d-845
• form factor: Rimm
• type: Rdram Ecc
• total capacity: 256 Mb
• number of pins: 184
• bus speed: 800.45
• memory features: Ecc Memory

general servermemor:

• Enterprise Networking, Servers > Server Components > Server Memory RAM
• condition: Used

seller servermemor:

• # reviews: 33
• rating: 100.0%
• city: Burlington, North Carolina

offer servermemor:

• quantity: 1
• options: Ship-to-home
• started: February 15, 2026
• availability: In Stock
• best offers: True
• sold: 0

returns servermemor:

• policy: No Returns

payments servermemor:

• wallet: Apple-pay
• credit card: Visa
• other

shipping servermemor:

• class: Standard
• transit: 5-11 Days
• cost: $5.29
• service: USPS Ground Advantage
• carrier: USPS
• type: Calculated

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