Dell PowerEdge R640 vs. R650: Is Upgrading to a Newer Generation Worth It?

Two Enterprise Powerhouses. One Important Decision.

When purchasing a refurbished enterprise server, one of the most important decisions is whether to invest in a newer generation or take advantage of the value offered by an older, proven platform.

The Dell PowerEdge R640 and Dell PowerEdge R650 are two excellent examples.

Both are powerful, dual-socket, 1U rack servers designed for virtualization, business applications, cloud infrastructure, and demanding data center environments.

However, while they share a similar form factor and many enterprise features, the R650 introduces several important improvements in processing technology, memory architecture, expansion bandwidth, and hardware design.

Does that mean the newer R650 is always the better purchase?

Not necessarily.

Let's compare these two Dell PowerEdge platforms and explore which one makes the most sense for your business, IT environment, or homelab.

Dell PowerEdge R640 vs. R650: Specifications at a Glance

Specifications represent platform capabilities and supported options, not the specifications of every individual server. Actual configurations vary by processor, backplane, controller, and installed components.

1. Processor Performance: A Major Generational Difference

One of the most significant differences between the R640 and R650 is the generation of Intel Xeon processors they support.

The Dell R640 supports 1st and 2nd Generation Intel Xeon Scalable processors, including select Silver, Gold, and Platinum models.

Depending on the configuration, the R640 can support up to 28 cores per processor, providing a maximum of 56 physical cores in a dual-processor system.

The Dell R650 takes things further with 3rd Generation Intel Xeon Scalable processors, supporting select models with up to 40 cores per processor.

That means a fully configured R650 can provide as many as 80 physical CPU cores.

But core count isn't the only advantage.

The newer processor architecture also introduces improvements in instructions-per-clock performance, memory capabilities, and support for modern workloads.

For businesses running multiple virtual machines, databases, application servers, or compute-intensive software, these improvements can translate into better overall performance.

However, an R640 equipped with high-end Xeon Gold or Platinum processors may still outperform an R650 equipped with lower-end processors in certain workloads.

The takeaway: The R650 offers greater maximum processing potential, but actual performance depends on the installed CPUs.

2. Memory: More Slots, More Channels, Greater Bandwidth

Both servers use DDR4 ECC enterprise memory, but the R650 features a significantly improved memory subsystem.

The R640 provides 24 DDR4 DIMM slots, with six memory channels per processor and memory speeds reaching up to 2933 MT/s with supported CPUs and DIMMs.

The R650 increases that to 32 DDR4 DIMM slots, eight memory channels per processor, and supported speeds reaching 3200 MT/s.

This is particularly important for memory-intensive workloads.

Virtualization hosts, large databases, analytics applications, and in-memory workloads can benefit from increased memory bandwidth and greater capacity options.

The additional DIMM slots also provide more flexibility when planning future memory upgrades.

For example, a business may initially deploy a server with a modest amount of RAM and gradually increase memory capacity as its virtual machine environment grows.

The R650 offers a more capable foundation for these types of deployments.

The takeaway: The R650 has the advantage in memory architecture, although the R640 still offers substantial memory capacity for many enterprise workloads.

3. PCIe Gen3 vs. PCIe Gen4: Why Expansion Bandwidth Matters

Perhaps one of the most meaningful improvements in the Dell R650 is the transition from PCIe Gen3 to PCIe Gen4.

The Dell R640 uses PCIe Gen3 expansion technology.

The Dell R650 supports PCIe Gen4, providing approximately twice the theoretical bandwidth per lane.

Why does this matter?

Modern enterprise environments increasingly rely on high-speed networking, NVMe storage, and bandwidth-intensive expansion devices.

PCIe Gen4 can provide meaningful advantages for compatible hardware, including:

• High-Speed Network Adapters

• NVMe Storage Expansion

• Storage Controllers

• Data-Intensive Applications

• High-Throughput Infrastructure

For businesses planning to expand their infrastructure, PCIe Gen4 provides additional flexibility.

However, if your applications primarily rely on traditional SAS storage, standard networking, and moderate workloads, PCIe Gen3 may already provide everything you need.

The takeaway: The R650 offers better expansion bandwidth, particularly for modern networking and high-performance storage applications.

4. Storage: Both Servers Offer Enterprise Flexibility

Both the Dell R640 and R650 support a variety of enterprise storage configurations.

Depending on the chassis and backplane, these platforms can be configured with SAS hard drives, SATA drives, SSDs, and supported NVMe storage.

Both servers are available in multiple drive-bay configurations, making them suitable for different storage requirements.

Dell R640 Storage Capabilities

The R640 supports configurations with 2.5-inch or 3.5-inch drives, including NVMe-capable options.

It also supports enterprise RAID controllers such as the Dell PERC H740P.

For organizations using traditional SAS or SATA storage, the R640 remains a highly capable platform.

Dell R650 Storage Capabilities

The R650 builds on that foundation with newer storage controller options, including the Dell PERC H755, and modern NVMe-capable configurations.

Combined with PCIe Gen4, the R650 can offer additional performance potential for supported high-speed storage deployments.

However, NVMe support should not be confused with universal compatibility.

The number of supported NVMe drives depends on the installed backplane, cabling, controller configuration, and other hardware options.

The takeaway: Both servers are excellent storage platforms, but the R650 provides a newer foundation for high-performance storage expansion.

5. Dedicated Boot Storage: BOSS-S1 vs. BOSS-S2

Dell's Boot Optimized Storage Solution, commonly called BOSS, allows compatible operating systems and hypervisors to be installed on dedicated M.2 SSDs.

This helps keep the primary front drive bays available for application and data storage.

The R640 supports the optional Dell BOSS-S1, while the R650 supports the newer BOSS-S2.

Both can provide dedicated boot storage using supported M.2 SSD configurations.

The newer BOSS-S2 design introduces improved serviceability, including supported hot-pluggable M.2 SSD carriers.

For businesses running virtualization hosts, separating the operating system from the primary data array can simplify storage management and maintenance.

However, BOSS cards and SSDs are optional equipment, so buyers should verify exactly what is included with a particular server.

The takeaway: Both generations offer dedicated boot storage options, but the R650's BOSS-S2 provides improved serviceability.

6. Virtualization: Which Server Is Better?

Virtualization is one of the most popular uses for both the R640 and R650.

These servers can provide excellent foundations for Proxmox VE, supported VMware environments, Microsoft Hyper-V, and other virtualization platforms.

Why Choose the Dell R640?

The R640 is an excellent option for organizations and individuals looking to build a capable virtualization environment without the higher cost typically associated with newer-generation hardware.

Its dual-processor architecture, extensive DDR4 memory support, and enterprise storage options make it a strong candidate for:

• Small Business Virtualization

• Proxmox Homelabs

• Development and Testing

• Internal Application Servers

• Virtual Machine Hosting

• Budget-Friendly Server Consolidation

For many moderate workloads, the R640 provides plenty of computing capability.

Why Choose the Dell R650?

The R650 offers a more modern foundation for virtualization.

Its higher maximum core count, increased memory bandwidth, PCIe Gen4 support, and newer storage options can make it particularly attractive for demanding environments.

Potential use cases include:

• Larger Virtual Machine Deployments

• Business-Critical Applications

• High-Performance Virtualization

• Private Cloud Infrastructure

• Database Hosting

• Modern Enterprise Workloads

• Long-Term Infrastructure Expansion

The takeaway: The R640 is an excellent value for virtualization, while the R650 offers more performance headroom and expansion potential.

Before purchasing either server, verify compatibility with the exact hypervisor version you intend to deploy.

7. Power Consumption, Cooling, and Noise

Both the R640 and R650 are enterprise rack servers designed primarily for data centers and professional IT environments.

Their compact 1U chassis provides excellent rack density, but this design also relies on high-speed cooling fans.

For homelab enthusiasts, this is an important consideration.

Neither model should be assumed to operate quietly enough for a bedroom, living room, or home office.

Power consumption also varies considerably depending on processor selection, memory configuration, installed drives, power supplies, and workload.

The R650's newer architecture may offer better performance per watt in certain configurations, but it is not automatically guaranteed to consume less electricity than an R640.

A high-core-count R650 may use considerably more power than a lightly configured R640.

The takeaway: Evaluate the specific hardware configuration rather than assuming the newer model will always be quieter or more energy-efficient.

8. Why Businesses May Benefit from Upgrading to the R650

For businesses, upgrading a server isn't simply about purchasing newer hardware.

It's about investing in infrastructure that supports current requirements while providing room for future growth.

The Dell R650 offers several compelling advantages.

Greater Processing Potential

With support for newer Xeon Scalable processors and higher maximum core counts, the R650 can accommodate more demanding workloads.

Improved Memory Architecture

Additional memory channels and DIMM slots provide greater flexibility for memory-intensive applications and virtualization environments.

Faster Expansion Technology

PCIe Gen4 offers additional bandwidth for compatible networking and storage devices.

Improved Boot Storage Options

BOSS-S2 offers a more serviceable dedicated boot-storage solution when installed.

Newer Hardware Foundation

The R650 provides a more modern enterprise architecture, making it an attractive option for businesses planning infrastructure upgrades.

These improvements can make the R650 a worthwhile investment for organizations seeking stronger performance and additional expansion capabilities.

However, businesses running relatively simple workloads may find that an R640 continues to meet their needs perfectly.

9. Is the Dell R640 Still Worth Buying?

Absolutely.

The Dell PowerEdge R640 remains an impressive enterprise server.

Its support for dual Intel Xeon Scalable processors, extensive DDR4 memory, flexible storage configurations, and enterprise management features makes it a highly capable platform.

For many buyers, its greatest advantage is value.

A refurbished R640 can provide substantial enterprise computing power at a cost that may be significantly lower than newer-generation alternatives.

This makes it particularly attractive for:

• Small Businesses

• IT Professionals

• Homelab Enthusiasts

• Backup Infrastructure

• Development Environments

• File and Application Servers

• Cost-Conscious Virtualization Projects

If your workload doesn't require PCIe Gen4, higher maximum core counts, or the R650's additional memory capabilities, an R640 may be the smarter financial decision.

10. Dell R640 vs. R650: Which Should You Buy?

Ultimately, choosing between these two servers comes down to your workload, budget, and future expansion plans.

Choose the Dell PowerEdge R640 If:

• You want affordable enterprise hardware.

• You're building a budget-conscious homelab.

• Your workloads don't require PCIe Gen4.

• You need a dependable file, backup, or application server.

• You're running moderate virtualization workloads.

• You want to maximize computing capability for your budget.

Choose the Dell PowerEdge R650 If:

• You want a newer-generation enterprise platform.

• You need stronger maximum CPU performance.

• You expect your virtualization environment to grow.

• You want greater memory bandwidth and expansion flexibility.

• You plan to use high-speed networking or NVMe storage.

• You want PCIe Gen4 support.

• You're investing in infrastructure for more demanding workloads.

Final Verdict: Proven Value or Modern Performance?

The Dell PowerEdge R640 and Dell PowerEdge R650 are both excellent enterprise servers, but they offer different advantages.

The R640 represents outstanding value, delivering dependable enterprise performance, substantial expandability, and proven Dell PowerEdge architecture at an affordable price.

The R650 represents the next step forward, offering newer Xeon processors, more memory channels, PCIe Gen4 expansion, improved boot storage options, and greater maximum processing capabilities.

For individuals building a homelab or businesses with straightforward infrastructure requirements, the R640 may be everything they need.

For organizations planning more demanding virtualization, faster storage, or future expansion, the R650 offers compelling advantages.

The best server isn't necessarily the newest one. It's the one that delivers the right performance, expandability, and value for your needs.

Explore our selection of refurbished Dell PowerEdge R640 and R650 servers to find the configuration that fits your next project.