This Compaq 326668-251 delivers Desktop Memory functionality and is built for 24/7 enterprise duty cycles. Technical specifications include capacity of 512 MB, number of sticks of 1, frequency of 400 MHz, connector of 184-pin, memory class of ECC, Unbuffered. Workload fit covers virtual desktop infrastructure (Citrix, VMware Horizon), Java application servers (Tomcat, JBoss, WebLogic), enterprise data warehouse (Teradata, Vertica), and Hadoop/Spark cluster compute. Pro Disk Network supplies the 326668-251 to US business buyers. Stocked units ship same-day on in-stock orders placed before 3pm ET. Pro Disk Network applies a 90-day functional warranty. Free US ground shipping on orders over $150; same-day expedited (UPS Next Day Air, FedEx Priority) available at checkout.
The 326668-251 is a Compaq desktop memory component with capacity 512 MB, number of sticks 1, frequency 400 MHz. Pro Disk Network sells the 326668-251 for $92.77 with same-day US shipping and a 30-day return guarantee.
Reviewed By
Reviewed by:Pro Disk Network Engineering Team — . Specifications, compatibility, and pricing for the 326668-251 are shown on this page.
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Quick Answer: What servers is the 326668-251 compatible with?
The 326668-251 is a Compaq desktop memory module. Confirm DIMM rank, voltage, and speed against the target server's supported memory list before deployment - mixed configurations may downclock to the slowest installed module. For server-specific population diagrams, email sales@prodisknetwork.com with your server serial number.
How fast does the 326668-251 ship?
If in stock, the 326668-251 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
The 326668-251 is deployed by US enterprises, MSPs, government, and education customers across multiple infrastructure scenarios. Below are the most common deployment patterns Pro Disk Network sees in real-world orders.
VMware Cluster Memory — Per-host memory expansion for vSphere ESXi hosts. Match DIMM rank and speed across all sockets to keep memory channels balanced.
In-Memory Database — SAP HANA, Redis Enterprise, Apache Ignite, Aerospike — workloads that scale linearly with DRAM capacity.
Hyper-V Cluster Node — Windows Server 2019/2022 Hyper-V hosts with Storage Spaces Direct. Dynamic memory allocation makes higher-density DIMMs cost-effective.
AI / ML Training — PyTorch and TensorFlow workloads benefit from large host memory pools for dataset preprocessing and CPU-side feature engineering.
What is the 326668-251?
The 326668-251 is a Compaq server memory module with capacity 512 MB and number of sticks 1, manufactured by Compaq. Pro Disk Network ships this part new and certified-refurbished from our US warehouse with same-day dispatch on orders placed before 3 PM ET, backed by a 30-day return guarantee.
Pros & Cons of 326668-251
Pros
RDIMM / LRDIMM clearly labelled for population-rule clarity
Cons
Server-grade DDR module — does not work in consumer desktops
Buffered (RDIMM) modules require server motherboards
Confirm voltage and channel rules before mixed-density installs
Frequently Asked Questions about 326668-251
Is the 326668-251 a genuine Compaq part?
Yes. Pro Disk Network sources every 326668-251 as factory-original Compaq inventory. New units arrive sealed in OEM packaging; refurbished units are pulled from decommissioned Compaq servers, surface-tested, and re-warranted by Pro Disk Network for 90 days.
What servers is the 326668-251 compatible with?
The 326668-251 is a Compaq desktop memory module. Confirm DIMM rank, voltage, and speed against the target server's supported memory list before deployment - mixed configurations may downclock to the slowest installed module. For server-specific population diagrams, email sales@prodisknetwork.com with your server serial number.
How fast does the 326668-251 ship?
If in stock, the 326668-251 ships same business day on US orders placed before 3 pm ET. Most US ZIP codes receive next-business-day or 2-day delivery via FedEx/UPS Ground or Express. Bulk and project orders shipping in pallets are typically dispatched within 24-48 hours.
What is the warranty on the 326668-251?
New 326668-251 units carry the full Compaq manufacturer warranty (typically 1 to 5 years depending on product line). Refurbished and bulk-OEM units include a Pro Disk Network advance-replacement warranty (90 days refurbished). DOA replacement is free within 30 days of receipt.
Do you offer bulk pricing for the 326668-251?
Email sales@prodisknetwork.com with the quantity and target ship date for a quote within one business day.
Compatibility: Rank, Density, and Channel Population Rules
For server memory, three numbers dominate compatibility: rank, density, and channel population. Mixing rank or density in the same channel forces the memory controller to fall back to the lowest-common-denominator speed and timings, sometimes by 200-400 MHz, which wastes the upgrade you just paid for. Before installing the 326668-251, run the platform's memory configuration utility (Dell DSET, HPE iLO Memory tab, Lenovo XCC Memory page) to identify what's already populated.
Pricing Strategy: New, Bulk, or Refurbished
For production tier-1 databases (SAP HANA, Oracle Exadata-equivalent, SQL Server Always On), use new sealed OEM units only. For VDI hosts, hyperconverged clusters, and general-purpose virtualisation, bulk-OEM is the cost-optimal choice. For development environments, lab gear, and capacity expansion on aging hardware, refurbished is appropriate — the price savings are 60-75% versus new.