Intel Core2 Quad Q8400S vs Intel Core2 Quad Q9550S: comparison
Comparison of Intel Core2 Quad Q8400S and Intel Core2 Quad Q9550S: key differences and a full specification table.
Key differences
Intel Core2 Quad Q9550S has a higher base clock (2.83 GHz vs 2.66 GHz).
Both processors match on: core count (4), thread count (4), TDP (65 W), process node (45 nm).
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 Core2 Quad Q8400S | Intel Core2 Quad Q9550S |
|---|---|---|
| Cores / threads | 4 / 4 | 4 / 4 |
| TDP | 65 W | 65 W |
| Process | 45 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 Core2 Quad Q8400S | Intel Core2 Quad Q9550S |
|---|---|---|
| General | ||
| Model | Q8400S | Q9550S |
| Codename | Yorkfield | Yorkfield |
| Segment | Desktop | Desktop |
| Product line | Legacy Intel Core Processors | Legacy Intel Core Processors |
| Process | 45 nm | 45 nm |
| Launch date | Q2 2009 | Q1 2009 |
| Status | Discontinued | Discontinued |
| Servicing status | End of Servicing Lifetime | End of Servicing Lifetime |
| Embedded options available | No | No |
| CPU | ||
| Cores | 4 | 4 |
| Threads | 4 | 4 |
| Multithreading (SMT/HT) | No | No |
| Base clock | 2.66 GHz | 2.83 GHz |
| L2 cache | 4 MB | 12 MB |
| Bus speed | 1.333 GHz | 1.333 GHz |
| TDP | 65 W | 65 W |
| Turbo Boost | No | No |
| 64-bit support | Yes | Yes |
| Instruction set width | 64 bit | 64 bit |
| VID voltage range | 0.8500V-1.3625V | 0.8500V-1.3625V |
| FSB parity | — | Yes |
| Package and thermal | ||
| Sockets supported | LGA775 | LGA775 |
| Package size | 37.5mm x 37.5mm | 37.5mm x 37.5mm |
| TCASE | 76.3 °C | 76.3 °C |
| Die size | 164 mm² | 214 mm² |
| Transistors (millions) | 456 million | 820 million |
| Security and virtualization | ||
| Virtualization (VT-x / AMD-V) | Yes | Yes |
| Virtualization for Directed I/O (VT-d) | — | Yes |
| AES-NI | No | No |
| Execute Disable Bit | Yes | Yes |
| Technologies | ||
| Enhanced SpeedStep | Yes | Yes |
| Idle States | Yes | Yes |
| Thermal Monitoring Technologies | Yes | Yes |