The best data center server overall in this roundup is the HPE ProLiant DL360 Gen11, thanks to its newer platform and clear configuration details. For buyers prioritizing core count, two Dell PowerEdge R640 options offer 40- or 44-core configurations, while the 10-bay R640 with 10GbE suits storage and network needs in a compact 1U chassis. The main tradeoffs are newer-generation support versus the capacity and compute configurations available in refurbished systems, plus the cost and effort of validating older hardware. Compare processor generation, memory, drive layout, and networking against your workload before choosing. Read on for the full breakdown and guidance by buyer type.
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Key Takeaways
- The HPE ProLiant DL360 Gen11 ranks first because its newer-generation platform and listed 16-core Xeon Gold 6526Y provide a clearer foundation for buyers prioritizing platform currency over maximum core count.
- The R640 models are not interchangeable. Their listed CPUs range from dual 6130 processors to 40- and 44-core configurations, so the right choice depends on workload and verified configuration details.
- The two 40-core R640 listings serve different priorities: one lists 15TB of storage, while another pairs dual Gold 6150 CPUs with 256GB of RAM and a mixed SSD/HDD layout.
- Memory capacity and drive layout matter as much as core count. Several R640s list 256GB, while the Gen11 and two high-core R640 options list 128GB.
- Networking and expansion can change the value of a refurbished server. The 10GbE R640 has a clear network advantage on paper, but buyers should confirm component condition, firmware, and support before deployment.
| data center server | Memory | Processor | Form factor | Model |
|---|---|---|---|---|
| Hewlett Packard Enterprise Pro | 128 GB DDR5 registered, 4 x 32 GB | 1x Intel Xeon Gold 6526Y, 16 cores, 2.8 GHz | 1U rack server | — |
| Dell PowerEdge R640 Server 2.4 | 128 GB RAM | 2.40 GHz, 40-core | — | Dell PowerEdge R640 |
| Dell PowerEdge R640 SAS/NVMe S | 128 GB RAM | 2.10 GHz, 44-core | — | Dell PowerEdge R640 |
| Dell PowerEdge R640 1U Rack Se | 256 GB DDR4, 8 x 32 GB | — | 1U rack server | — |
| Dell PowerEdge R640 Server 2x | 256 GB RAM | — | — | Dell PowerEdge R640 |
| Dell PowerEdge R640 10x SFF | 256GB DDR4 | 2 × Intel Xeon Gold 6130, 2.1GHz, 16 cores each | 1U rackmount | — |
More Details on Our Top Picks
Hewlett Packard Enterprise ProLiant DL360 Gen11 Rack Server with Intel Xeon Gold 6526Y Processor, 2.8 GHz 16-core, 128 GB RAM, NS204i-u NVMe, 8 SFF, 1000W RPS (Model P71678-005)
The HPE ProLiant DL360 Gen11 is my pick for teams building a dense server environment around current-generation hardware rather than maximizing core count per unit. Its 1U chassis, DDR5 memory, and PCIe Gen5 expansion suit virtualization and container workloads where rack space and an upgrade path matter. Compared with the renewed Dell PowerEdge R640 options here, it offers a newer platform and clearer management and security provisions through iLO6, but its single 16-core processor has far fewer cores than the 40- and 44-core R640 configurations. The dual hot-plug power supplies and eight SFF bays give it useful resilience and storage flexibility. The tradeoff is a single-socket ceiling and a base configuration that may be more server than a small operation needs.
Pros:- DDR5 memory supports substantial capacity growth, up to 8 TB.
- Dual 1000 W hot-plug power supplies provide redundancy.
- Eight hot-plug SFF bays and an NVMe boot device offer flexible storage setup.
- iLO6 management, Silicon Root of Trust, and PCIe Gen5 suit managed data center deployments.
Cons:- Single-socket design limits CPU scaling compared with dual-processor R640 models.
- Its 16-core processor has a lower listed core count than the renewed 40- and 44-core alternatives.
- The feature-rich configuration may be excessive for small businesses with modest workloads.
Best for: Data center teams prioritizing a current-generation 1U platform, remote management, and future memory and PCIe expansion for virtualized workloads.
Not ideal for: Buyers whose main goal is the highest core count or storage capacity per server; the dual-CPU Dell R640 configurations offer more cores in the listed builds.
- Form factor:1U rack server
- Processor:1x Intel Xeon Gold 6526Y, 16 cores, 2.8 GHz
- Memory:128 GB DDR5 registered, 4 x 32 GB
- Maximum memory:Up to 8 TB DDR5
- Drive bays:8 x hot-plug SFF
- Boot device:HPE NS204i-u Gen11 NVMe hot-plug boot device
- Power:2 x 1000 W Flex Slot Titanium hot-plug supplies
- Management and security:iLO6, SGX, Silicon Root of Trust
Our verdict“Choose the DL360 Gen11 if you want a new-generation, space-efficient platform with strong expansion and management features more than maximum cores per server.”
Dell PowerEdge R640 Server 2.40GHz 40-Core 128GB RAM 15TB Storage Rails (Renewed)
This renewed Dell PowerEdge R640 is the capacity-focused choice in this group: its listed 40 cores and 15 TB of storage suit established workloads that need substantial compute and local space in one server. Compared with the R640 offering 44 cores and 6.4 TB of SSD storage, this configuration gives up some listed cores while providing more total storage; the product details do not specify the drive type, so I would verify that before planning latency-sensitive applications. It also has less memory than the 256 GB R640 builds, including the dual Gold 6150 model. The renewed status and limited configuration detail make careful confirmation of components and condition part of the buying decision. I’d shortlist it for storage-heavy consolidation, not for buyers who need a fully documented configuration.
Pros:- Listed 40-core processor provides substantial parallel compute capacity.
- 15 TB of listed storage supports workloads that need considerable local capacity.
- 128 GB of RAM is a useful starting point for multiple services or virtual machines.
- Rails are included, helping prepare the server for rack installation.
Cons:- Storage drive type and configuration are not specified, making performance planning harder.
- Renewed condition may not suit buyers seeking new hardware or a known service history.
- At 128 GB, included memory is lower than the 256 GB R640 configurations in this roundup.
Best for: IT teams seeking a renewed 40-core R640 with substantial local storage for file services, backups, or consolidated business workloads.
Not ideal for: Buyers needing verified SSD performance, a clearly specified RAID or management setup, or more than 128 GB of included memory.
- Model:Dell PowerEdge R640
- Processor:2.40 GHz, 40-core
- Memory:128 GB RAM
- Storage:15 TB; drive type not specified
- Condition:Renewed
- Included installation hardware:Rails
Our verdict“Pick this R640 when listed storage capacity matters more than a fully detailed component specification or maximum included memory.”
Dell PowerEdge R640 SAS/NVMe Server 2.10GHz 44-Core 128GB RAM 6.4TB SSDs (Renewed)
With a listed 44-core processor and 6.4 TB of SSD storage, this renewed R640 is the strongest fit here for parallel workloads that also benefit from solid-state storage. That combination makes it a more compelling choice for compute and storage responsiveness than the 40-core, 15 TB R640, though the latter lists considerably more capacity. It also has less included memory than the 256 GB R640 options, so memory-heavy virtualization may call for an upgrade or a different configuration. The listing identifies SAS/NVMe but does not spell out the specific drive arrangement, controller, or management features. I’d treat those omissions as purchase checks, especially for a production environment. Its appeal is the stated balance of many cores and SSD capacity, not configuration transparency.
Pros:- The listed 44-core processor has the highest core count among the products in this batch.
- 6.4 TB of SSD storage is suited to workloads that need faster local storage than unspecified drive types.
- 128 GB RAM provides a practical base for general enterprise workloads.
- Power cords are included, and configuration options may be available.
Cons:- Included memory is half that of the 256 GB R640 configurations.
- Renewed condition leaves more uncertainty about service history and remaining component life.
- Drive layout, controller, and remote management details are not specified.
Best for: Data center operators running parallel compute, application, or database workloads that benefit from SSD storage and can validate the renewed configuration.
Not ideal for: Memory-intensive virtualization teams or buyers who need high local storage capacity, detailed drive specifications, and a clearly documented management setup.
- Model:Dell PowerEdge R640
- Processor:2.10 GHz, 44-core
- Memory:128 GB RAM
- Storage:6.4 TB SSD
- Storage interface:SAS/NVMe listed; drive arrangement not specified
- Condition:Renewed
- Included accessories:Power cords
Our verdict“Choose this R640 for a high-core-count build with listed SSD storage, provided its memory and exact drive configuration meet your workload needs.”
Dell PowerEdge R640 1U Rack Server (Renewed) – 2x Intel Xeon Gold 6150, 256GB RAM, 2x 480GB SSD + 6x 1.2TB HDD
This renewed PowerEdge R640 pairs two Xeon Gold 6150 processors with 256 GB of memory, making it a well-rounded option for virtualized environments that need more than a high core count alone. Its two SSDs and six SAS hard drives create a useful split between faster storage and higher-capacity disks, unlike the 44-core R640, which lists SSD storage but less memory and no specific hybrid layout. The included iDRAC9 Enterprise license, dual power supplies, and network ports also give this build a more clearly described operational setup than several other renewed listings. The tradeoffs are its older DDR4 platform, renewed condition, and substantial 50.1 lb weight. Its 36 total cores are also fewer than the 40- and 44-core alternatives.
Pros:- Dual Xeon Gold 6150 processors provide 36 total cores for concurrent workloads.
- 256 GB DDR4 memory supports larger virtual machine and service deployments.
- The mix of SSDs and SAS HDDs balances faster storage with greater capacity.
- iDRAC9 Enterprise, dual power supplies, and multiple network interfaces offer a more complete deployment setup.
Cons:- Its 36 total cores are fewer than the 40- and 44-core R640 configurations.
- Renewed condition and the DDR4 platform may not suit buyers seeking new, current-generation hardware.
- At 50.1 lb, installation requires suitable rack equipment and handling.
Best for: Virtualization and infrastructure teams seeking a documented dual-processor 1U server with 256 GB RAM, mixed SSD/HDD storage, and remote management.
Not ideal for: Buyers prioritizing the newest platform, the highest core count, or a lightweight system; the Gen11 HPE is newer, while other R640 listings offer more cores.
- Form factor:1U rack server
- Processors:2 x Intel Xeon Gold 6150, 2.70 GHz, 18 cores each
- Memory:256 GB DDR4, 8 x 32 GB
- Storage:2 x 480 GB SATA SSD + 6 x 1.2 TB SAS HDD; 8.2 TB listed total
- RAID controller:H730P integrated, 2 GB cache
- Power:2 x 1100 W Platinum AC supplies
- Remote management:iDRAC9 Express with Enterprise license
- Network:Dual-port 10GbE SFP+, dual-port 1GbE RJ-45, dual-port 10GbE RJ-45
- Condition and weight:Renewed; 50.1 lb
Our verdict“Choose this R640 for a comparatively well-documented virtualization build with 256 GB RAM, hybrid storage, and remote management.”
Dell PowerEdge R640 Server 2x Gold 6148 2.4GHz 40-Core 256GB RAM + 8 Caddies (Renewed)
This renewed R640 is a practical fit for buyers who want dual Xeon Gold 6148 processors, 256 GB of RAM, and eight drive caddies without committing to a stated drive set. The empty or configurable-bay approach can be useful when a data center needs to match drives to its own capacity, endurance, or storage policy. Compared with the dual Gold 6150 R640, it lists 40 cores rather than 36 and the same memory capacity, but the other model provides a specified SSD/HDD mix, RAID controller, and iDRAC9 Enterprise license. Here, storage devices, controller, network, and management details are not supplied, so I would confirm them before treating this as a ready-to-deploy server. Its strength is the processor-and-caddy foundation, not a complete known configuration.
Pros:- Dual Xeon Gold 6148 processors provide 40 total cores.
- 256 GB RAM is suited to larger virtualized or concurrent workloads.
- Eight included caddies provide a foundation for populating drive bays.
- A drive configuration chosen by the buyer can align storage with existing standards.
Cons:- Drive capacity, drive types, RAID controller, and network details are not specified.
- Remote management features are not identified, unlike the R640 with iDRAC9 Enterprise.
- Renewed condition and the listed high-performance configuration may raise power and lifecycle concerns.
Best for: Infrastructure teams that already source their own drives and want a 40-core, 256 GB R640 with eight caddies for a tailored storage build.
Not ideal for: Buyers who need a server ready for immediate deployment with specified drives, RAID, network interfaces, and remote management.
- Model:Dell PowerEdge R640
- Processors:2 x Intel Gold 6148, 2.4 GHz
- Total cores:40
- Memory:256 GB RAM
- Drive caddies:8
- Storage drives:Not specified
- Condition:Renewed
Our verdict“Choose this R640 if you want 40 cores and 256 GB RAM in a drive-configurable build and can verify the missing system details.”
Dell PowerEdge R640 10x SFF, 2x Xeon Gold 6130 CPU, 256GB Memory, PERC HBA330, 2x 600GB HDD, 2-Port 10GbE, Rails (Renewed)
I’d choose this R640 when 256GB of DDR4 memory and two processors matter more than fast or plentiful included storage. Its dual Xeon Gold 6130 CPUs and 10GbE networking suit virtualization hosts and compute nodes that rely on shared storage or plan to add drives. Compared with the other renewed R640 configurations in this roundup, this one is defined by its memory and network combination, not its drive capacity: it arrives with only two 600GB 10K SAS HDDs. That limits ready-to-use local storage, despite the 10-bay SFF chassis description. The refurbished condition also brings more uncertainty about component life than a new server such as the HPE ProLiant DL360 Gen11. I’d shortlist it for a memory-led workload, but skip it if you need high-capacity storage from day one.
Pros:- 256GB of DDR4 supports multiple virtual machines and memory-intensive services.
- Two Xeon Gold 6130 processors provide substantial multi-core compute capacity.
- Dual 10GbE ports suit fast links to networked storage and high-throughput infrastructure.
- 1U chassis with rails fits rack deployments where space matters.
Cons:- Only two 600GB SAS hard drives are included, so usable local capacity is limited.
- Renewed condition creates uncertainty around component wear and remaining service life.
- No bezel is included, and drive expansion may require additional compatible hardware.
Best for: Data center operators building virtualization hosts with substantial memory needs, shared storage, and a plan to expand local drives.
Not ideal for: Buyers who need large local storage capacity immediately, want a new server, or require assurance of long remaining hardware life.
- Processor:2 × Intel Xeon Gold 6130, 2.1GHz, 16 cores each
- Memory:256GB DDR4
- Included storage:2 × 600GB 10K SAS HDD
- Drive bays:10 × SFF
- Network:2 × 10GbE
- Storage controller:PERC HBA330
- Power supply:2 × 750W
- Form factor:1U rackmount
- Dimensions:35 × 24 × 9 inches
Our verdict“Pick this renewed R640 for memory-heavy virtualization with shared storage, but choose a higher-capacity configuration if local disk space is a priority.”
How We Picked
I ranked these servers by how clearly their listed configurations match common data center jobs: general-purpose virtualization, compute-heavy services, storage capacity, and network-intensive workloads. I weighed processor generation and core count alongside memory, drive type and bay count, networking, and the practical value of a complete rack-ready configuration. A higher core count did not automatically earn a higher position; the platform age, memory, storage mix, and missing configuration details also affect deployment risk.
The HPE DL360 Gen11 leads for buyers who favor a newer platform and a well-specified base configuration. The R640s follow in role-based order: the 44-core system for dense compute, the 40-core 15TB system for capacity, then the 256GB configurations for memory and mixed storage needs. The final R640 is a more specific, older dual-CPU configuration with 10GbE and 10 drive bays, but its listed drive capacity is modest. Since five listings are renewed, I treat verification of exact components, condition, firmware, and warranty as part of the buying decision rather than assuming a uniform refurbished specification.
Factors to Consider When Choosing Best Data Center Servers
Server selection starts with the job the machine must do and the operating limits of the rack it will occupy. I would compare usable capacity and lifecycle needs, not just headline core counts: a server that fits the workload but lacks the required network ports, storage interface, or support path can create extra work after arrival.
Match CPU layout to the workload
Core count helps with parallel workloads, but it does not describe performance on its own. Check the processor generation, clock behavior, software licensing model, and whether the application benefits from one or two sockets. Dual-socket systems can offer more aggregate cores, though some software licenses per socket or core and may make that capacity costly to use. A newer platform with fewer cores can be a better fit when per-core performance, platform features, or a longer support horizon matter. Avoid choosing by the largest core number without checking the actual CPU model and application requirements.
Plan memory for growth, not only first deployment
Memory affects how many virtual machines, databases, or in-memory services can run before workloads compete for resources. Start with current usage, then account for expected growth and failover capacity rather than treating listed RAM as a fixed target. Check the number and type of installed DIMMs, supported memory speeds, available slots, and the cost of matching modules. A server with 128GB may be a sensible starting point if it has a practical upgrade path, while a 256GB configuration can reduce immediate expansion work. Confirm the exact memory population because a total alone does not reveal upgrade flexibility.
Choose drive capacity and media for the data pattern
Drive count and capacity do not tell the whole storage story: media type, controller, RAID plan, and workload write patterns matter too. SSDs suit latency-sensitive services, while HDDs can support larger capacity needs where access speed is less demanding. Mixed configurations can separate operating-system or active data from bulk storage, but they also require a clear plan for redundancy and replacement. Check whether drive caddies are included, which interfaces and sizes the chassis accepts, and whether the listed capacity is raw or usable after redundancy. Do not assume a server’s maximum bay count means it arrives populated to that level.
Verify network and expansion requirements
Network capability can set the ceiling for storage traffic, virtualization, and clustered workloads even when CPU and memory appear sufficient. Confirm port count, speed, connector type, and whether the listed adapter is included rather than relying on the chassis family name. Also check PCIe slots, riser configuration, and room for future adapters or storage controllers. A 10GbE configuration may be useful for heavier east-west traffic, but it is not automatically necessary for every deployment. Match server ports to switch capacity and cabling already installed to avoid paying for upgrades that your environment cannot use.
Account for rack, power, cooling, and noise
A 1U server saves rack space, but dense systems can concentrate heat and may require higher airflow than a lightly loaded unit. Check rack depth, rail compatibility, inlet temperature limits, power-supply redundancy, and the electrical capacity available at the rack. Redundant supplies help with power-path resilience, but they do not replace a proper circuit and cooling plan. Also check acoustic output if the server will be placed near staff or in a small lab rather than a dedicated data center. Chassis dimensions and power details should be confirmed for the exact configuration, not inferred from a product family.
Treat refurbished listings as configuration-specific
Renewed servers can provide useful capacity, but condition and included parts vary by listing. Ask for the exact service tag or serial number, CPU and memory inventory, drive health information, firmware status, and confirmation of rails, caddies, and power supplies. Check warranty length, return terms, and whether replacement parts are available through your support channel. Older platforms may still serve well for labs or established workloads, but lifecycle status and security updates can matter more than the initial hardware specification. Build in time to validate the machine before placing production services on it.
Frequently Asked Questions
Should I choose the HPE Gen11 or a higher-core Dell R640?
Choose the HPE DL360 Gen11 if a newer platform and a clearly specified current-generation configuration matter more than the highest listed core count. The Dell R640 options may suit parallel workloads that can use their larger aggregate core counts, but they are renewed systems based on an older platform. Compare the exact application performance, memory needs, software licensing, and support horizon rather than relying on cores alone. Also verify the R640’s actual CPU and component configuration with the seller. The better fit depends on workload and lifecycle policy, not brand preference.
Which R640 listing makes the most sense for storage-heavy work?
The 40-core R640 listing that specifies 15TB stands out for buyers seeking listed capacity, while the 10-bay R640 offers more explicit chassis and network details but lists only two 600GB HDDs. Those are different propositions: installed capacity is not the same as expansion potential. Confirm drive type, usable capacity after RAID, controller support, and whether all required caddies are included. For latency-sensitive storage, check the exact SSD configuration rather than assuming a server with many bays is SSD-ready. Pick the listing that matches both the data volume and the access pattern.
Is a renewed R640 suitable for production use?
It can be, if its configuration, condition, and support arrangements fit your production standards. Request component-level details, drive health information, firmware status, warranty terms, and a clear return process before deployment. Check the platform’s lifecycle and security-update position against your organization’s policies. Plan acceptance testing and keep compatible replacement parts available for the components most likely to affect service. For workloads requiring a longer vendor support runway, a newer platform such as the HPE Gen11 may be a better match.
How much should I prioritize 256GB of RAM over more CPU cores?
Prioritize memory when workloads are constrained by resident data, virtual machine density, or database caching; prioritize cores when the work can run across more processor threads. The R640 listings with 256GB may reduce immediate memory upgrades, while the 44-core configuration lists 128GB and could need expansion for memory-heavy jobs. Check actual peak memory use, not just average utilization, and leave room for failover or growth. Also review DIMM layout and open slots, since those determine how straightforward an upgrade will be. Neither RAM nor core count is a reliable shortcut without workload data.
What should I verify before ordering a rack server from a listing?
Confirm the exact CPU models, installed memory modules, storage devices, RAID or HBA controller, network adapters, power supplies, rails, and drive caddies. Ask whether stated storage is raw capacity and whether the listed components are the ones that will ship. For renewed hardware, request warranty and return details plus available condition or drive-health records. Check rack depth, power connections, airflow, and compatibility with your existing switches and storage. A short written configuration confirmation can prevent a mismatch between the listing headline and the server delivered.
Conclusion
For the best overall choice, I recommend the HPE ProLiant DL360 Gen11 for buyers who favor a newer platform and a clearly described configuration. For value, look at the Dell R640 40-core, 15TB listing if its storage and renewed condition meet your requirements; verify the exact components before purchase. For premium compute among these options, choose the 44-core R640 when your workload can use its cores and you accept the older platform. For beginners, the HPE is the clearest starting point because its listing is more straightforward, though deployment still calls for compatibility checks. For a specific need, the 10-bay R640 with listed 10GbE is the pick for buyers who prioritize expansion and faster networking; compare its installed drive capacity with your actual storage plan before deciding.
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