General

Engineer's Note

Designed for legacy entry-level servers and workstations requiring data integrity, this Samsung M391T2953EZ3-CF7 DDR2 UDIMM is a 1GB PC2-6400 module operating at 800MHz with CL6 latency. Its dual-rank x8 organization enhances memory bandwidth utilization, while unbuffered ECC consistently corrects single-bit errors to prevent data corruption in critical applications.

Technical Specs & Insights

1. ECC protection automatically corrects single-bit memory errors, preserving data integrity for mission-critical services and reducing costly server downtime in always-on environments.
2. DDR2 technology offers proven, mature signaling stability in legacy server platforms, ensuring seamless compatibility with long-lifecycle enterprise deployments.
3. A 1GB capacity suits dedicated lightweight server roles such as firewall appliances or embedded controllers, where a lean memory footprint boosts reliability and reduces attack surface.
4. 800MHz speed delivers steady memory bandwidth that keeps latency-sensitive network processes and basic virtualized workloads running without data bottlenecks.
5. Dual Rank x8 organization enables interleaved access across rank boundaries, maximizing channel utilization and sustaining consistent throughput under concurrent I/O operations.

Why These Specs Matter

The Samsung M391T2953EZ3-CF7 is a server-grade DDR2 Unbuffered ECC UDIMM, engineered for legacy infrastructure where every bit of data integrity matters. In a lightweight virtualized host running critical network services like DNS and DHCP alongside a small intrusion-detection system, its ECC circuitry actively corrects single-bit errors induced by background radiation. This prevents silent data corruption that could quietly crash a hypervisor or render virtual disk images unusable—keeping your always-on services genuinely reliable. When that same server is running a memory-resident database such as Redis to accelerate web application lookups, the unbuffered design reduces latency because the memory controller talks directly to the DRAM without passing through a register, so every request completes one clock cycle faster. The dual rank x8 organization further boosts performance by interleaving internal banks, which allows the 800MHz clock to sustain higher effective throughput during concurrent read/write bursts. With a modest 1.8V draw, the module also runs cooler in constrained 1U chassis, safeguarding stability around the clock. This combination of error correction, low-latency unbuffered signaling, dual rank parallelism, and disciplined 800MHz timing means your legacy systems handle transactional consistency and responsiveness with zero surprises.

Endurance & Reliability

Server Memory (DDR2 ECC Unbuffered DIMM)

General Virtualization
For legacy servers running light hypervisors, install matching pairs of these 1GB modules to enable dual-channel interleaving and reduce memory latency. Aim for at least four modules (4GB total) to host two to three lightweight VMs, ensuring ECC corrects single-bit errors in shared memory spaces.

In-Memory Database
Databases relying on RAM for working sets demand maximum capacity and data integrity. Populate all available DIMM slots with these ECC UDIMMs—six to eight modules give 6GB to 8GB—to hold small caches or lookup tables while allowing the memory controller to operate in dual-channel mode for improved throughput.

High-Performance Computing
In compute-bound cluster nodes built on older platforms, equip each node with an identical set of four or eight modules to sustain dual-channel bandwidth during parallel MPI tasks. ECC is non-negotiable for result accuracy, and populating all channels balances memory bandwidth per core, helping avoid memory bottlenecks in repetitive floating-point workloads.

Verified Compatibility

Rigorously tested for server compatibility. Verified with Dell PowerEdge R300, HP ProLiant ML110 G5.

FAQ