Intel Core2 Extreme QX6700 vs Intel Core2 Duo E6400: comparison
Comparison of Intel Core2 Extreme QX6700 and Intel Core2 Duo E6400: key differences and a full specification table.
Key differences
Intel Core2 Extreme QX6700 has more cores (4 vs 2), more threads (4 vs 2) and a higher base clock (2.66 GHz vs 2.13 GHz).
At the same time, Intel Core2 Duo E6400 has a lower TDP (65 W vs 130 W).
Both processors match on: process node (65 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 Extreme QX6700 | Intel Core2 Duo E6400 |
|---|---|---|
| Cores / threads | 4 / 4 | 2 / 2 |
| TDP | 130 W | 65 W |
| Process | 65 nm | 65 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 Extreme QX6700 | Intel Core2 Duo E6400 |
|---|---|---|
| General | ||
| Model | QX6700 | E6400 |
| Codename | Kentsfield | Conroe |
| Segment | Desktop | Desktop |
| Product line | Legacy Intel Core Processors | Legacy Intel Core Processors |
| Process | 65 nm | 65 nm |
| Launch date | Q4 2006 | Q3 2006 |
| Status | Discontinued | Discontinued |
| Servicing status | End of Servicing Lifetime | End of Servicing Lifetime |
| Embedded options available | No | Yes |
| CPU | ||
| Cores | 4 | 2 |
| Threads | 4 | 2 |
| Multithreading (SMT/HT) | No | No |
| Base clock | 2.66 GHz | 2.13 GHz |
| L2 cache | 8 MB | 2 MB |
| Bus speed | 1.066 GHz | 1.066 GHz |
| TDP | 130 W | 65 W |
| Turbo Boost | No | No |
| 64-bit support | Yes | Yes |
| Instruction set width | 64 bit | 64 bit |
| VID voltage range | 0.8500V-1.500V | 0.8500V-1.5V |
| FSB parity | No | No |
| Package and thermal | ||
| Sockets supported | LGA775 | PLGA775, LGA775 |
| Package size | 37.5mm x 37.5mm | 37.5mm x 37.5mm |
| TCASE | 64.5 °C | 61.4 °C |
| Die size | 286 mm² | 111 mm² |
| Transistors (millions) | 582 million | 167 million |
| Security and virtualization | ||
| Virtualization (VT-x / AMD-V) | Yes | Yes |
| AES-NI | No | No |
| Execute Disable Bit | Yes | Yes |
| Technologies | ||
| Enhanced SpeedStep | Yes | Yes |
| Idle States | Yes | Yes |
| Thermal Monitoring Technologies | Yes | Yes |