Xeon E3-1280 v5 vs Xeon E5-2665
Xeon E3-1280 v5
Xeon E5-2665
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Xeon E3-1280 v5 is positioned at rank 354 and the Xeon E5-2665 is on rank 348, so the Xeon E5-2665 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Xeon E3-1280 v5
Performance Per Dollar Xeon E5-2665
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Xeon E3-1280 v5 | Xeon E5-2665 |
|---|---|---|
| Gaming | ❌ Lower gaming performance | ✅ Superior gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | Equivalent pricing | Equivalent pricing |
| Longevity | 🛑 Legacy (Skylake-S (2015) / 14 nm) | 🛑 Legacy (Sandy Bridge-EP (2012) / 32 nm) |
💎 Value Proposition
| Insight | Xeon E3-1280 v5 | Xeon E5-2665 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | Equivalent pricing | Equivalent pricing |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of Xeon E3-1280 v5 and Xeon E5-2665
Xeon E3-1280 v5
The Xeon E3-1280 v5 is manufactured by Intel. It was released in 19 October 2015 (10 years ago). It is based on the Skylake-S (2015) architecture. It features 4 cores and 8 threads. Base frequency is 3.7 GHz, with boost up to 4 GHz. L3 cache: 8 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 80 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 8,254 points. Launch price was $612.
Xeon E5-2665
The Xeon E5-2665 is manufactured by Intel. It was released in 6 March 2012 (13 years ago). It is based on the Sandy Bridge-EP (2012) architecture. It features 8 cores and 16 threads. Base frequency is 2.4 GHz, with boost up to 3.1 GHz. L3 cache: 20480 kB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA2011. Thermal design power (TDP): 115 Watt. Memory support: DDR3. Passmark benchmark score: 8,293 points. Launch price was $142.
Processing Power
The Xeon E3-1280 v5 packs 4 cores / 8 threads, while the Xeon E5-2665 offers 8 cores / 16 threads — the Xeon E5-2665 has 4 more cores. Boost clocks reach 4 GHz on the Xeon E3-1280 v5 versus 3.1 GHz on the Xeon E5-2665 — a 25.4% clock advantage for the Xeon E3-1280 v5 (base: 3.7 GHz vs 2.4 GHz). The Xeon E3-1280 v5 uses the Skylake-S (2015) architecture (14 nm), while the Xeon E5-2665 uses Sandy Bridge-EP (2012) (32 nm). In PassMark, the Xeon E3-1280 v5 scores 8,254 against the Xeon E5-2665's 8,293 — a 0.5% lead for the Xeon E5-2665. L3 cache: 8 MB (total) on the Xeon E3-1280 v5 vs 20480 kB (total) on the Xeon E5-2665.
| Feature | Xeon E3-1280 v5 | Xeon E5-2665 |
|---|---|---|
| Cores / Threads | 4 / 8 | 8 / 16+100% |
| Boost Clock | 4 GHz+29% | 3.1 GHz |
| Base Clock | 3.7 GHz+54% | 2.4 GHz |
| L3 Cache | 8 MB (total) | 20480 kB (total)+150% |
| L2 Cache | 256K (per core) | 256 kB (per core) |
| Process | 14 nm-56% | 32 nm |
| Architecture | Skylake-S (2015) | Sandy Bridge-EP (2012) |
| PassMark | 8,254 | 8,293 |
Memory & Platform
The Xeon E3-1280 v5 uses the LGA1151 socket (PCIe 3.0), while the Xeon E5-2665 uses LGA2011 (PCIe 5.0) — making them incompatible on the same motherboard.
| Feature | Xeon E3-1280 v5 | Xeon E5-2665 |
|---|---|---|
| Socket | LGA1151 | LGA2011 |
| PCIe Generation | PCIe 3.0 | PCIe 5.0+67% |
| Max RAM Speed | — | DDR3-1600 |
| Max RAM Capacity | — | 384 GB |
| RAM Channels | — | 4 |
| ECC Support | — | ✅ |
| PCIe Lanes | — | 40 |
Advanced Features
Virtualization: not specified (Xeon E3-1280 v5) / VT-x, VT-d (Xeon E5-2665). Primary use case: Xeon E5-2665 targets Server.
| Feature | Xeon E3-1280 v5 | Xeon E5-2665 |
|---|---|---|
| Integrated GPU | — | No |
| Unlocked | — | No |
| AVX-512 | — | Yes |
| Virtualization | — | VT-x, VT-d |
| Target Use | — | Server |
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