Overview
The Dell PowerEdge R740 and R750 represent consecutive generations of Dell's flagship 2U rack server. For organizations evaluating used server purchases or considering upgrades, understanding the differences between these platforms is crucial for making cost-effective infrastructure decisions.
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Dell PowerEdge R740: 14th generation Intel-based server supporting 1st and 2nd Gen Intel Xeon Scalable processors (Skylake and Cascade Lake). A proven workhorse with massive deployment base.
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Dell PowerEdge R750: 15th generation platform supporting 3rd Gen Intel Xeon Scalable processors (Ice Lake) with PCIe Gen4, faster memory, and improved thermal design.
The decision between these servers often comes down to workload requirements, budget constraints, and existing infrastructure compatibility.
Specifications Comparison
| Parameter | Dell PowerEdge R740 | Dell PowerEdge R750 |
|---|---|---|
| Generation | 14th Gen | 15th Gen |
| CPU Support | Up to 2x Intel Xeon Scalable (1st/2nd Gen) | Up to 2x Intel Xeon Scalable (3rd Gen) |
| Max Cores | 56 cores (2x 28c) | 80 cores (2x 40c) |
| Memory | DDR4-2666/2933 (24 DIMMs) | DDR4-3200 (32 DIMMs) |
| Max Memory | 3TB | 4TB |
| PCIe | Gen3 | Gen4 |
| Drive Bays | Up to 16x 2.5" or 8x 3.5" | Up to 24x 2.5" or 12x 3.5" |
| Power Supplies | 495W-1600W Platinum | 800W-2400W Titanium |
| Management | iDRAC9 | iDRAC9 (enhanced) |
Used Market Pricing
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Dell PowerEdge R740: Currently trading between $2,500–$5,000 depending on CPU, memory, and storage configuration. High-end configurations with Cascade Lake CPUs and NVMe backplanes command premiums.
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Dell PowerEdge R750: Ranges from $4,000–$8,000, with Ice Lake CPUs and PCIe Gen4 configurations at the higher end. Still relatively new to the secondary market.
Price Influencers:
- CPU Generation: R740s with 2nd Gen Scalable CPUs are 20-30% more expensive than 1st Gen equivalents.
- Storage Backplane: NVMe-capable backplanes add $300-500 to server value.
- GPU Support: GPU-optimized variants (R740xd2, R750xa) command 25-40% premiums.
- Warranty: Remaining Dell ProSupport transfers add significant value.
When to Choose Each
Dell PowerEdge R740
- Budget Constraints: 40-50% lower cost makes it ideal for cost-sensitive expansions.
- PCIe Gen3 Sufficiency: Workloads not requiring Gen4 speeds (most general compute).
- Proven Stability: Well-understood platform with extensive troubleshooting knowledge base.
- Memory-Bound Workloads: DDR4-2933 performance is comparable to DDR4-3200 for many applications.
Dell PowerEdge R750
- New Deployments: Better long-term support and modern feature set for greenfield builds.
- PCIe Gen4 Requirements: NVMe storage arrays, 100G+ networking, GPU accelerators.
- Core Density: Ice Lake CPUs offer up to 40 cores per socket vs. 28 in Cascade Lake.
- Memory Bandwidth: DDR4-3200 and additional DIMM slots benefit memory-intensive workloads.
Secondary Market Availability
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Dell PowerEdge R740: Very high availability due to massive enterprise deployment and current refresh cycles. Both standard and dense (R740xd) variants readily available.
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Dell PowerEdge R750: Moderate availability as the platform is newer. Availability increasing as early adopters refresh to R760 platforms.
Sourcing Challenges:
- Rails Compatibility: R740 and R750 use different rail kits; verify inclusion or budget $150-200.
- Heatsinks: High-TDP CPU configurations require specific heatsinks often missing from barebone units.
- Caddies: Drive caddies are frequently missing; budget $15-25 per caddy.
- Firmware: Ensure iDRAC and BIOS are at compatible firmware levels.
Verdict
For new infrastructure deployments or PCIe Gen4-dependent workloads, the R750 is the clear choice. Its superior core density, memory capacity, and modern I/O justify the price premium for forward-looking investments.
For capacity expansions, secondary workloads, or budget-constrained environments, the R740 offers exceptional value. Its mature platform, broad compatibility, and lower cost make it ideal for general compute, virtualization, and storage workloads.
Recommendation:
- R750: Deploy for primary production environments, AI/ML infrastructure, and high-performance databases.
- R740: Ideal for dev/test environments, backup infrastructure, and general virtualization clusters.
Many organizations successfully operate mixed R740/R750 environments, leveraging the R750 for performance-critical workloads while maximizing value with R740s for standard compute needs.