Dell PowerEdge R6625 vs R7625
Dell PowerEdge R6625
Dell PowerEdge R7625
The PowerEdge R6625 and R7625 are the same processor story in two different chassis. Both are 16th-generation, dual-socket AMD EPYC 9004 servers with the same CPU ceiling, the same 24-slot DDR5 memory topology, PCIe Gen5 I/O, and iDRAC9 management. The R6625 packs all of that into 1U for maximum compute density per rack. The R7625 spreads it across 2U to make room for far more drives, more PCIe expansion, and GPU acceleration. So this is not an Intel-versus-AMD or fast-versus-slow decision. It comes down to what you need around the CPUs: raw density in a space-constrained rack, or storage capacity and accelerator headroom in a taller chassis. This page frames where each one earns its slot. Final configurations, options, and availability should always be confirmed with Uniqcli before purchase.
Side by side
| Dell PowerEdge R6625 | Dell PowerEdge R7625 | |
|---|---|---|
| Form factor & rack density | 1U rack chassis. Roughly doubles the compute nodes per rack versus 2U, ideal where rack units and floor space are the constraint. | 2U rack chassis. Half the node density of 1U, using the extra height for storage, PCIe expansion, and GPUs. |
| CPU platform | Dual-socket AMD EPYC 9004 series (Genoa, Genoa-X, Bergamo), SP5 socket. Up to 128 cores per socket, up to 256 per server. | Same dual-socket AMD EPYC 9004 platform and core ceiling. Compute per node is effectively identical to the R6625. |
| Memory | 24 DDR5 RDIMM slots, 12 channels per socket, speeds up to 4800 MT/s. | Same 24-slot DDR5 topology and channel layout. No memory advantage either way. |
| Storage capacity & flexibility | 1U bay count is limited: up to roughly 10x 2.5-inch SAS/SATA/NVMe, or high-density E3.S Gen5 NVMe options. | Much deeper: up to 24x 2.5-inch NVMe/SAS/SATA, 12x 3.5-inch, or E3.S configurations, including mixed layouts. |
| GPU & accelerator support | Minimal. 1U leaves room only for low-profile cards, not double-width GPUs. | GPU-capable: up to 2 double-wide (or several single-wide) full-length GPUs for moderate acceleration. |
| PCIe expansion | Fewer, low-profile PCIe Gen5 slots, sized for NICs, HBAs, and boot or OCP 3.0 options. | More PCIe Gen5 slots and riser choices, including full-height cards for GPUs, DPUs, and high-speed fabric. |
| Cooling & power | Tighter 1U thermal envelope. The highest-TDP EPYC parts (up to about 400W) reach Direct Liquid Cooling sooner; air cooling covers mainstream SKUs. | More air-cooling headroom in 2U for sustained high-TDP EPYC, with Direct Liquid Cooling available for the hottest configurations. |
| Management & security | iDRAC9 with Lifecycle Controller, Redfish API, Silicon Root of Trust, TPM, and System Lockdown. | Identical: iDRAC9 with Lifecycle Controller, Redfish API, Silicon Root of Trust, TPM, and System Lockdown. |
| Where it fits best | Dense scale-out and HPC racks, virtualization-at-scale, and cloud-native fleets where compute per rack unit is the priority. | Storage-rich nodes, software-defined storage, capacity-heavy databases, and mixed workloads that want a GPU or heavy PCIe I/O beside the CPUs. |
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Dell PowerEdge R6625
Dell PowerEdge R7625
Choose the Dell PowerEdge R6625 when
Rack density is the priority. In 1U you get the full dual-socket AMD EPYC 9004 platform, up to 256 cores per server, and the same DDR5 memory topology as the R7625, at roughly twice the node density per rack. That makes it the stronger pick for scale-out and HPC clusters, virtualization-at-scale, and cloud-native fleets where compute per rack unit and per watt drives the economics. Storage is deliberately modest and there is no room for double-width GPUs, so the R6625 is right when the workload lives in CPU and memory, not on local disk or accelerators. Plan for Direct Liquid Cooling if you spec the highest-TDP EPYC parts, and model per-core software licensing against those high core counts. Send us the rack, power, and node count and we will size a full cluster on /bom.
Choose the Dell PowerEdge R7625 when
You need room around the same CPUs. The 2U chassis carries the identical dual-socket AMD EPYC 9004 compute as the R6625, then adds far more drive bays (up to 24x 2.5-inch or 12x 3.5-inch), more PCIe Gen5 expansion, and space for up to two double-wide GPUs. That makes it the better platform for storage-rich nodes, software-defined storage, database and analytics hosts with large local capacity, and mixed workloads that want moderate GPU or DPU acceleration without moving to a GPU-first chassis. The extra height also buys more air-cooling headroom for sustained high-TDP EPYC. You trade rack density for expandability, which is exactly the right trade when the job needs capacity and I/O next to the cores. Spec drives, GPUs, and cooling with us on /quote.
Neither server is better in the abstract. They are the same 16G, dual-socket AMD EPYC 9004 platform in two chassis, so the decision is density versus expandability, not performance. Choose the R6625 (1U) when you want maximum compute per rack and the workload lives in cores and memory: scale-out, HPC, virtualization-at-scale, and cloud-native fleets. Choose the R7625 (2U) when you need storage capacity, more PCIe expansion, or GPU acceleration alongside the same CPUs. Qualify on three things: how many nodes you must fit per rack, how much local storage and I/O the workload needs, and whether GPUs are in the picture. Both are TAA-compliant Dell PowerEdge systems backed by the same warranty, ProSupport, and supply chain, and both are quotable on federal vehicles. As an independent integrator and authorized Dell partner, Uniqcli sells both and can model total cost against your actual workload. Start a build on /bom or send requirements to /quote.
Talk to a specialistFrequently asked
What is the main difference between the PowerEdge R6625 and R7625?
The chassis, not the processor. Both are 16th-generation, dual-socket AMD EPYC 9004 servers with the same core ceiling and the same 24-slot DDR5 memory topology. The R6625 fits it into 1U for maximum rack density, while the R7625 uses 2U to add far more drive bays, more PCIe Gen5 slots, and support for up to two double-wide GPUs. Pick based on density versus expandability, since compute per node is effectively the same.
Do the R6625 and R7625 deliver the same CPU performance?
Yes, effectively. They share the dual-socket AMD EPYC 9004 platform, up to 128 cores per socket and 256 per server, and the same memory channels and DDR5 speeds. A given CPU SKU performs the same in either chassis. The R7625's advantage is not more compute, it is more room for storage, PCIe expansion, and GPUs around those CPUs.
Can I run GPUs in the R6625?
Not double-width GPUs. The 1U R6625 has room only for low-profile cards, so it is not the platform for accelerated workloads. If you need one or two double-wide, full-length GPUs beside the CPUs, the 2U R7625 is the right sibling. For GPU-dense AI in 2U, a purpose-built chassis such as the R760xa goes further. We can help you compare options on /quote.
Which one is better for storage-heavy workloads?
The R7625. Its 2U chassis supports far more drives, up to 24x 2.5-inch NVMe/SAS/SATA, 12x 3.5-inch, or E3.S configurations, versus the 1U R6625's roughly 10 bays. For software-defined storage, large local databases, or capacity-rich nodes, the R7625 gives you the bays and PCIe lanes to match. If the workload is compute-bound with modest storage, the denser R6625 is usually the better value.
Are both TAA-compliant and available on federal contracts?
Yes. Both the R6625 and R7625 are Dell PowerEdge systems that can be configured TAA-compliant and quoted for federal buyers through the vehicles Uniqcli supports, including GSA and NASA SEWP V, and they are eligible for GPC card purchases within thresholds. Tell us the contract and configuration on /quote and we will confirm compliance and lead time for your specific build.
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