1U Rack Servers
Refurbished 1U rack servers — maximum compute per rack unit for virtualization clusters, web farms, and colocation racks, built to your CPU, memory, and drive spec.
Refurbished 1U rack servers — maximum compute in minimum rack space. One rack unit (1.75″) tall, these are the workhorses of virtualization clusters, web farms, and colocation racks: Dell PowerEdge R630, R640, R650, R660, HPE ProLiant DL360, single-socket AMD EPYC platforms, and more — custom-configured, tested, and warrantied.
Shop 1U servers by model
Dell PowerEdge 1U
- PowerEdge R640 — 14th-gen dual Xeon Scalable; the most popular refurbished 1U server, deep in stock in 8-bay and 10-bay chassis.
- PowerEdge R630 — 13th-gen dual Xeon; unbeatable budget compute.
- PowerEdge R650 / R660 — 15th/16th-gen with DDR5 and PCIe Gen5 on R660.
- PowerEdge R440 — value 1U dual-socket for general workloads.
- AMD EPYC 1U: R6515, R6525, R6615, R6625 — up to 128 cores in one U. See all AMD EPYC servers.
HPE ProLiant 1U
- ProLiant DL360 Gen10 / Gen11 — HPE’s flagship 1U for virtualization and databases.
- ProLiant DL325 Gen11 / Gen12 — single-socket AMD EPYC 1U with dual-socket-class performance.
- ProLiant DL365 Gen10 Plus / Gen11 — dual EPYC in 1U.
Why choose a 1U server?
Rack space costs money — colocation is billed by the U. A 1U server delivers two full CPU sockets, terabytes of RAM, and 8–10 NVMe/SAS/SATA bays in the smallest standard footprint. Stack a full 42U cabinet and you get over 40 dual-socket nodes. The trade-off vs 2U servers: fewer drive bays and PCIe slots, and smaller (louder) fans — which is why 1U is the data-center pick, not the office pick (for quiet office servers, see tower servers).
Every PCSP 1U server is custom-configured to your spec, fully tested, backed by a 1-year warranty (extendable to 5), and ships fast from the US.
A 1U chassis gives you eight to ten small-form-factor bays depending on the model, and that ceiling decides the array as much as the workload does. What is a RAID array? shows the minimum drive count for each level, so you can tell before ordering whether RAID 10 fits in the bays you have.
Frequently Asked Questions
What is a 1U rack server?
A 1U server occupies one rack unit — 1.75 inches (44.45 mm) of vertical space in a standard 19-inch rack. It is the densest standard server form factor: dual CPUs, up to a few terabytes of RAM, and 8–10 drive bays in a single U.
What is the most popular 1U server?
The Dell PowerEdge R640 and HPE ProLiant DL360 Gen10 are the most-deployed refurbished 1U servers — dual Xeon Scalable CPUs, large DDR4 capacity, and proven reliability at a fraction of new pricing.
When should I pick 1U over 2U?
Pick 1U when rack space is the constraint and your storage is external (SAN/NAS/cloud) — virtualization hosts, web and application tiers, HPC nodes. Pick 2U when you need many local drives, GPUs, or extra PCIe expansion.
How deep and loud are 1U servers?
Most 1U servers are 27–31 inches deep and use small high-RPM fans, so they are designed for server rooms, not offices. If noise matters, choose a tower server or a 2U platform with larger fans.
Can I configure a 1U server that is out of stock?
Yes. Any 1U server not currently in stock is available to configure by quote — we will build it to your CPU, RAM, and storage spec and price it usually within hours.
Build your own 1U configuration online, or request a quote for a custom spec.