Dell PowerEdge R660 vs R6625
Dell PowerEdge R660 (Intel 1U)
Dell PowerEdge R6625 (AMD dual-socket 1U)
The PowerEdge R660 and R6625 are both current-generation 1U, dual-socket rack servers from Dell's 16th-generation (16G) lineup, and they share a near-identical chassis, DDR5 memory, PCIe Gen5 I/O, and the iDRAC9 management platform. The defining difference is the processor: the R660 runs Intel Xeon Scalable CPUs, while the R6625 runs AMD EPYC. That single choice cascades into core counts, memory layout, power and cooling, and software-licensing math. This page lays out the practical differences so a buyer can match the right platform to a real workload. As a Dell-only comparison, both are first-party Dell PowerEdge systems backed by the same warranty, ProSupport, and supply chain. Configurations vary widely by build, so treat the figures here as platform maximums and capabilities rather than a quote for any specific unit.
Side by side
| Dell PowerEdge R660 (Intel 1U) | Dell PowerEdge R6625 (AMD dual-socket 1U) | |
|---|---|---|
| Processor family | Dual-socket Intel Xeon Scalable, 4th Gen (Sapphire Rapids) and 5th Gen (Emerald Rapids) | Dual-socket AMD EPYC 9004 series (4th Gen, Genoa / Genoa-X / Bergamo), SP5 socket |
| Core count | Up to 56 cores per socket (up to 112 cores per server, 5th Gen) | Up to 128 cores per socket (up to 256 cores per server with Bergamo Zen 4c) |
| Memory | Up to 32 DDR5 DIMM slots (16 per socket), up to 8TB; speeds up to 5600 MT/s on 5th Gen | 24 DDR5 DIMM slots (12 channels per socket), DDR5 at up to 4800 MT/s |
| Form factor & I/O | 1U dual-socket; PCIe Gen5; OCP 3.0; iDRAC9 with Lifecycle Controller | 1U dual-socket; PCIe Gen5; OCP 3.0; iDRAC9 with Lifecycle Controller |
| Storage options | Up to 10x 2.5-inch SAS/SATA/NVMe, plus E3.S Gen5 NVMe configurations (up to 16 E3.S) | Similar 1U layout: 2.5-inch SAS/SATA/NVMe and high-density E3.S Gen5 NVMe options |
| Cooling & power | Air-cooled across the lineup; broad selection of mainstream-TDP SKUs | Air-cooled up to ~300W TDP; high-TDP CPUs (up to 400W) need Direct Liquid Cooling (DLC) |
| Where it fits best | Virtualization, databases, and apps tuned for Intel; AVX-512/AMX acceleration; built-in accelerators (QAT, DSA) | Core-dense, throughput, HPC, scale-out and cloud-native workloads that reward many cores and memory bandwidth |
| Licensing consideration | Lower per-socket core counts can mean fewer per-core licenses for the same socket count | Very high core density can raise per-core software licensing costs (e.g., per-core VM or DB licensing) |
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Dell PowerEdge R660 (Intel 1U)
Dell PowerEdge R6625 (AMD dual-socket 1U)
Choose the R660 (Intel) when
Your stack is validated, tuned, or licensed around Intel Xeon, or you want a broad catalog of mainstream-TDP, fully air-cooled SKUs that drop into standard racks without liquid cooling. The R660's larger 32-DIMM memory topology (up to 8TB) suits memory-heavy virtualization and database hosts, and Intel's on-die accelerators (AMX for AI inference, QAT for crypto/compression, DSA) help specific workloads. Moderate per-socket core counts can also keep per-core software licensing in check. It's the safe, broadly compatible default for general enterprise virtualization and consolidation.
Choose the R6625 (AMD) when
You need maximum compute density in 1U. With up to 128 cores per socket (256 per server) and 12 memory channels per socket, the R6625 excels at throughput-bound, scale-out, HPC, and cloud-native workloads where core count and memory bandwidth drive value. It can deliver more performance per rack unit and, for many parallel workloads, strong performance per watt. Be ready to plan for cooling: the highest-TDP EPYC parts (up to 400W) require Direct Liquid Cooling, and very high core counts can increase per-core software licensing, so model total cost, not just hardware.
Neither server is universally better; they are two CPU answers to the same 1U dual-socket question. The R660 (Intel) is the pragmatic, broadly compatible choice with a deeper memory footprint, easy air cooling, and an edge for Intel-validated software and accelerator-driven tasks. The R6625 (AMD) wins on raw core density and aggregate throughput per rack unit, making it the stronger pick for HPC, virtualization-at-scale, and cloud-native fleets, provided you account for liquid cooling on top SKUs and per-core licensing. Decide based on three things: what your software is licensed and tuned for, how many cores per U you actually need, and your data center's power and cooling envelope. As a Dell reseller, Uniqcli can spec either platform and help model the total cost of ownership against your specific workload.
Talk to a specialistFrequently asked
What is the main difference between the PowerEdge R660 and R6625?
The processor architecture. The R660 uses dual Intel Xeon Scalable CPUs (4th/5th Gen), while the R6625 uses dual AMD EPYC 9004 series CPUs. Both are 16G, 1U, dual-socket servers with DDR5, PCIe Gen5, and iDRAC9, so the rest of the platform is very similar. That CPU choice then drives differences in maximum core count, memory channels, and cooling requirements.
Does the R6625 really need liquid cooling?
Only for its highest-TDP configurations. The R6625 supports AMD EPYC parts up to roughly 400W per socket, and those high-TDP CPUs require Direct Liquid Cooling. Standard air cooling covers configurations up to about 300W TDP. The R660 lineup, by contrast, is air-cooled. If your facility cannot support DLC, you can still run the R6625 with air-cooled CPU choices.
Which server is better for software licensing costs?
It depends on how your software is licensed. Many enterprise products (some hypervisors, databases) charge per core, so the AMD R6625's very high core counts (up to 256 per server) can increase license costs even though the hardware is dense. The Intel R660's lower per-socket core counts may reduce per-core licensing for the same number of sockets. Always model licensing alongside hardware, because it can outweigh the server price difference over the system's life.
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