MICRON M386A4G400M0-CPB Server Memory Ram Supermicro 32GB PC4-2933 1RX4 39

( Brand: Micron ), ( Manufacturer Part Number: M386A4G400M0-CPB ), ( Total Capacity: 32 Gb ), ( Memory Features: Ecc Memory, Registered, Fully Buffered ), ( Form Factor: Lrdimm ), ( Type: Ddr4 Sdram ), ( Unit Type: Unit ), ( Manufacturer Warranty: No ), ( Item Height: 30mm ), ( Number Of Pins: 288 ), ( Bus Speed: Pc4-23400 ), ( Country Of Origin: China )

Review MICRON 1rx4 Registered Server Memory Ram Lot Of 39 Supermicro

The **Micron M386A4G400M0-CPB** is a high-performance, low-latency DDR4 server memory module designed specifically for demanding enterprise and data center applications, engineered to deliver unparalleled reliability, scalability, and efficiency in mission-critical environments. Part of Micron s **Supermicro-optimized** line of memory solutions, this **32GB (4x8GB) RDIMM (Registered DIMM)** module operates at an industry-leading **PC4-2933 (DDR4-2400)** speed, ensuring blazing-fast data transfer rates of **2400 MT/s** with a robust **CL17-17-17** CAS latency profile, striking an optimal balance between speed and stability for high-throughput workloads. Built with **Micron s advanced 16Gb (2048Mb) DDR4 DRAM chips**, this module leverages **Micron s proven reliability and endurance**, featuring **ECC (Error-Correcting Code) memory** to detect and correct single-bit errors on the fly, safeguarding data integrity in critical applications such as virtualization, high-performance computing (HPC), and large-scale database management systems.

The **M386A4G400M0-CPB** is a **1Rx4 (1-rank x 4 DIMMs per module)** configuration, which enhances memory bandwidth and reduces latency by allowing for deeper pipelining and improved channel utilization in multi-socket server systems. This design is particularly advantageous in **Supermicro s high-density server platforms**, where efficient memory architecture is essential for maximizing performance in multi-core and multi-threaded workloads. The module is **fully compatible** with Supermicro s **X12 series, X13 series, and other high-end server motherboards**, including those featuring **Intel Xeon Scalable (SAP, SP, and SR families)** and **AMD EPYC** processors, ensuring seamless integration into modern data center infrastructures. Its **low-power, high-efficiency** design helps reduce operational costs while maintaining peak performance, making it an ideal choice for energy-conscious enterprises.

Constructed with **industry-standard DDR4 technology**, this memory module supports **Micron s advanced memory controllers and signal integrity optimizations**, including **Micron s proprietary **DIMM termination and impedance matching**, which minimizes signal reflections and crosstalk, ensuring stable operation even in high-speed, multi-channel configurations. The module is **fully tested and validated** for **24/7 uptime**, featuring **enhanced thermal stability** and **robust power delivery** to prevent errors under sustained heavy loads. Additionally, it adheres to **Supermicro s strict compatibility requirements**, including **Micron s **Memory Test and Validation Program (MTVP)**, which guarantees flawless performance across a wide range of server configurations.

Whether deployed in **virtualized environments, AI/ML workloads, or large-scale enterprise storage solutions**, the **Micron M386A4G400M0-CPB** delivers a **proven combination of speed, reliability, and scalability**, making it a cornerstone for next-generation data center deployments. Its **enterprise-grade build quality**, **low-latency architecture**, and **Supermicro-specific optimizations** ensure that it not only meets but exceeds the demands of the most rigorous server applications, providing a future-proof investment for organizations seeking peak performance without compromise.

**Pros and Cons of Buying Micron M386A4G400M0-CPB (PC4-2933, 32GB, 1Rx4) Server Memory for Supermicro Systems**

### **Pros**

1. **High Performance and Speed**

The M386A4G400M0-CPB is a DDR4-2933 (PC4-2933) module, which offers faster data transfer rates compared to slower DDR4 variants (e.g., DDR4-2400). This can improve system responsiveness, especially in compute-intensive workloads like virtualization, database operations, or high-performance computing (HPC).

2. **Low Latency (CL16)**

The module has a CAS latency of 16 (CL16), which is relatively low for DDR4 memory. Lower latency reduces delays in data access, benefiting applications that rely on fast memory response times.

3. **Reliability and Quality**

Micron is a well-established manufacturer known for producing high-quality, stable memory modules. This reduces the risk of frequent failures or compatibility issues, which is critical in server environments where uptime is paramount.

4. **Compatibility with Supermicro**

The module is explicitly designed for Supermicro motherboards (as indicated by the "Supermicro" label), ensuring proper fit and functionality. Supermicro systems often require specific memory configurations, and this module is likely optimized for their platforms.

5. **Error Correction (ECC)**

This is an ECC (Error-Correcting Code) module, which helps detect and correct single-bit errors in memory. ECC is essential for servers to prevent data corruption, especially in critical applications like databases, financial systems, or virtualization.

6. **Registered (Buffered) Design (1Rx4)**

The 1Rx4 configuration means it is a registered (buffered) module, which helps reduce memory bus contention and improves stability in multi-socket or high-channel-count systems. This is particularly useful in Supermicro s high-end servers.

7. **Scalability**

32GB per module allows for easy expansion in systems that support multiple slots. This makes it cost-effective for building larger memory configurations without needing multiple smaller modules.

8. **Widely Available and Supported**

Micron s memory is widely supported by server vendors, and the M386A4G400M0-CPB is a standard part number, meaning it is likely to be readily available from authorized distributors or Micron s resellers.

---

### **Cons**

1. **Higher Cost Compared to Lower-Speed DDR4**

DDR4-2933 modules are generally more expensive than slower DDR4 variants (e.g., DDR4-2400 or DDR4-2666). If your workload does not require the higher speed, you may be paying a premium for performance you don t need.

2. **Power Consumption**

Faster memory modules (like DDR4-2933) consume more power than slower ones. In large server deployments, this can contribute to higher energy costs and heat generation, requiring additional cooling solutions.

3. **Potential Overkill for Less Demanding Workloads**

If your server is running lightweight applications (e.g., web hosting, basic file servers, or non-virtualized workloads), DDR4-2933 may not provide a noticeable performance benefit. In such cases, a slower but more cost-effective module (e.g., DDR4-2400) might suffice.

4. **Limited Future-Proofing**

While DDR4-2933 is faster than DDR4-2400, it is not the absolute latest standard (DDR5 is now becoming mainstream). If you plan to upgrade your server in the near future, investing in DDR5 memory might be more future-proof, though this depends on your system s compatibility.

5. **Compatibility with Older Supermicro Platforms**

While this module is labeled for Supermicro, some older Supermicro motherboards may not support DDR4-2933, especially if they were released before the widespread adoption of high-speed DDR4. Always verify your motherboard s QVL (Qualified Vendor List) or documentation to ensure compatibility.

6. **Potential for Higher Heat Output**

Higher-speed memory can generate more heat, which may require additional thermal management in densely populated server racks. This could necessitate better airflow or cooling solutions.

7. **Licensing or Warranty Restrictions**

Some server memory modules come with restrictions on usage (e.g., non-transferable warranties or licensing agreements). Ensure you review Micron s terms to avoid unexpected limitations.

---

### **Conclusion**

The **Micron M386A4G400M0-CPB (DDR4-2933, 32GB, 1Rx4, ECC)** is an excellent choice for **Supermicro servers** running **compute-heavy, latency-sensitive, or virtualized workloads** where performance is critical. Its **high speed (2933MHz), low latency (CL16), ECC protection, and registered design** make it well-suited for environments where reliability and performance are non-negotiable.

However, if your workload is **less demanding** or your budget is constrained, a **slower but still high-quality DDR4 module (e.g., 2400MHz or 2666MHz)** may offer a better cost-to-performance ratio. Additionally, if you are planning a **long-term upgrade path**, consider whether DDR5 compatibility is a future requirement.

For most **Supermicro server deployments in enterprise, cloud, or high-performance environments**, this module is a **strong recommendation** due to its balance of speed, reliability, and compatibility.

---

### **Final Recommendation**

- You are using a **Supermicro server** (verify QVL compatibility).

- Your workload requires **high memory bandwidth and low latency** (e.g., virtualization, databases, HPC, or real-time processing).

- You prioritize **reliability and ECC protection** for critical data.

- Your system supports **DDR4-2933** and you can justify the cost.

- Your workload is **lightweight** and does not benefit from DDR4-2933.

- You are on a **tight budget** and can use a slower but still stable DDR4 module.

- You plan to **upgrade to DDR5 soon** and want to future-proof your investment.

For most **Supermicro server users in performance-critical applications**, this is a **solid, high-quality choice**. Always cross-reference with your motherboard s documentation to confirm compatibility.

Details:

No hardware defects. Micron PC4-2933 32GB 1Rx4 Registered Server Memory RAM Lot of 39 Supermicro, C5 - Used Very Good. Minor dents and areas of discoloration from the removal tags. F4 - Hardware Functional Appendix C Test and Repair.

No missing or damaged components parts. Minor wear of labeling may be visible. Software not loaded or configured. No missing parts.

All hardware is tested and verified working through manual or software tests. These items may have some damage, missing parts or pieces and make the item non-functional. Items are 100% guaranteed to be received as described. Cosmetic blemishes include minor scratches and/or other surface imperfections from consistent use, but equipment is in good condition.

part #: m386a4g400m0 prices

• $178.00-$1133.00

specifications servermemor:

• brand: Micron
• mpn: M386a4g400m0-cpb
• total capacity: 32 Gb
• memory features: Ecc Memory, Registered, Fully Buffered
• form factor: Lrdimm
• type: Ddr4 Sdram
• unit type: Unit
• manufacturer warranty: No
• item height: 30mm
• number of pins: 288
• bus speed: Pc4-23400
• country of origin: China

seller servermemor:

• rating: 100.0%
• city: Las Vegas, Nevada
• # reviews: 32387

offer servermemor:

• options: Ship-to-home
• availability: In Stock
• best offers: True
• quantity: 1
• sold: 0
• started: April 17, 2026

returns servermemor:

• paid by: Seller
• time: 30 Days
• method: Money back
• policy: Returns Accepted

general servermemor:

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

payments servermemor:

• credit card: Discover
• wallet: Google-pay
• other

shipping servermemor:

• service: UPS Ground, UPS 3 Day Select, UPS Next Day Air
• type: Fixed
• transit: 3-6 Days
• carrier: UPS
• class: Standard, Expedited, One-day
• cost: $0.00

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