Intel Xeon E5645 vs Intel Xeon E5503: comparison
Comparison of Intel Xeon E5645 and Intel Xeon E5503: key differences and a full specification table.
Key differences
Intel Xeon E5645 has more cores (6 vs 2), more threads (12 vs 2), a higher base clock (2.4 GHz vs 2 GHz) and a larger L3 cache (12 MB vs 4 MB).
Both processors match on: TDP (80 W), memory channels (3).
These are specification values: they show differences between the models but do not determine a performance winner. For a specific workload, rely on independent benchmarks.
Key specifications
| Parameter | Intel Xeon E5645 | Intel Xeon E5503 |
|---|---|---|
| Cores / threads | 6 / 12 | 2 / 2 |
| Max boost clock | 2.67 GHz | — |
| L3 cache | 12 MB | 4 MB |
| TDP | 80 W | 80 W |
| Process | 32 nm | 45 nm |
Full specification table
Differing values are highlighted. This is not a better/worse rating: numbers from different architectures are not always comparable.
| Parameter | Intel Xeon E5645 | Intel Xeon E5503 |
|---|---|---|
| General | ||
| Model | E5645 | E5503 |
| Codename | Westmere EP | Nehalem EP |
| Segment | Server | Server |
| Product line | Устаревшие процессоры Intel Xeon | Устаревшие процессоры Intel Xeon |
| Process | 32 nm | 45 nm |
| Launch date | Q1 2010 | Q1 2010 |
| Status | Discontinued | Discontinued |
| Servicing status | End of Servicing Lifetime | End of Servicing Lifetime |
| Embedded options available | Yes | No |
| Use conditions | Communications | — |
| CPU | ||
| Cores | 6 | 2 |
| Threads | 12 | 2 |
| Multithreading (SMT/HT) | Yes | No |
| Base clock | 2.4 GHz | 2 GHz |
| Max boost clock | 2.67 GHz | — |
| L3 cache | 12 MB | 4 MB |
| Bus speed | 5.86 GT/s | 4.8 GT/s |
| TDP | 80 W | 80 W |
| Turbo Boost | Yes (1) | No |
| 64-bit support | Yes | Yes |
| Instruction set width | 64 bit | 64 bit |
| Instruction set extensions | SSE4.2 | — |
| QPI links | 2 | 2 |
| Memory | ||
| Max memory size | 288 GB | 144 GB |
| Memory types | DDR3 | DDR3 |
| Memory channels | 3 | 3 |
| Max memory bandwidth | 32 GB/s | 19.2 GB/s |
| ECC memory supported | Yes | Yes |
| Physical address extensions | 40-bit | 40-bit |
| Package and thermal | ||
| Sockets supported | FCLGA1366 | FCLGA1366 |
| Max CPU configuration | 2 | — |
| Package size | 42.5mm X 45mm | 42.5mm x 45mm |
| TCASE | 76.2 °C | 76 °C |
| Security and virtualization | ||
| Virtualization (VT-x / AMD-V) | Yes | Yes |
| Virtualization for Directed I/O (VT-d) | Yes | Yes |
| Extended Page Tables (EPT) | Yes | Yes |
| AES-NI | Yes | No |
| Execute Disable Bit | Yes | Yes |
| Intel Trusted Execution Technology | Yes | No |
| Technologies | ||
| Enhanced SpeedStep | Yes | Yes |
| Idle States | Yes | Yes |
| Thermal Monitoring Technologies | No | No |