Intel Core i7-640M vs Intel Core i7-840QM: comparison
Comparison of Intel Core i7-640M and Intel Core i7-840QM: key differences and a full specification table.
Key differences
Intel Core i7-640M has a higher base clock (2.8 GHz vs 1.86 GHz), a higher maximum clock (3.46 GHz vs 3.2 GHz), a lower TDP (35 W vs 45 W) and a finer process node (32 nm vs 45 nm).
At the same time, Intel Core i7-840QM has more cores (4 vs 2), more threads (8 vs 4) and a larger L3 cache (8 MB vs 4 MB).
Both processors match on: maximum memory size (8 GB), memory channels (2), PCIe version (2).
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 Core i7-640M | Intel Core i7-840QM |
|---|---|---|
| Cores / threads | 2 / 4 | 4 / 8 |
| Max boost clock | 3.46 GHz | 3.2 GHz |
| L3 cache | 4 MB | 8 MB |
| TDP | 35 W | 45 W |
| Process | 32 nm | 45 nm |
| Integrated graphics | Intel HD Graphics for Previous Generation Intel Processors | — |
Full specification table
Differing values are highlighted. This is not a better/worse rating: numbers from different architectures are not always comparable.
| Parameter | Intel Core i7-640M | Intel Core i7-840QM |
|---|---|---|
| General | ||
| Model | i7-640M | i7-840QM |
| Codename | Arrandale | Clarksfield |
| Segment | Mobile | Mobile |
| Product line | Legacy Intel Core Processors | Legacy Intel Core Processors |
| Process | 32 nm | 45 nm |
| Launch date | Q3 2010 | Q3 2010 |
| Status | Discontinued | Discontinued |
| Servicing status | End of Servicing Updates | End of Servicing Updates |
| Embedded options available | No | No |
| CPU | ||
| Cores | 2 | 4 |
| Threads | 4 | 8 |
| Multithreading (SMT/HT) | Yes | Yes |
| Base clock | 2.8 GHz | 1.86 GHz |
| Max boost clock | 3.46 GHz | 3.2 GHz |
| L3 cache | 4 MB | 8 MB |
| Bus speed | 2.5 GT/s | 2.5 GT/s |
| TDP | 35 W | 45 W |
| Turbo Boost | Yes (1) | Yes (1) |
| 64-bit support | Yes | Yes |
| Instruction set width | 64 bit | 64 bit |
| Instruction set extensions | SSE4.1, SSE4.2 | SSE4.2 |
| Memory | ||
| Max memory size | 8 GB | 8 GB |
| Memory types | DDR3 | DDR3 |
| Memory channels | 2 | 2 |
| Max memory bandwidth | 17.1 GB/s | 21 GB/s |
| ECC memory supported | No | No |
| Physical address extensions | 36-bit | 36-bit |
| Graphics | ||
| Integrated graphics | Intel HD Graphics for Previous Generation Intel Processors | — |
| Has integrated graphics | Yes | — |
| Graphics base frequency | 500 MHz | — |
| Graphics max frequency | 766 MHz | — |
| Max displays | 2 | — |
| Flexible Display Interface | Yes | — |
| Macrovision license required | No | — |
| I/O and interfaces | ||
| PCI Express revision | 2 | 2 |
| PCI Express lanes | 16 | 16 |
| PCI Express configurations | 1x16 | 1x16, 2x8 |
| Package and thermal | ||
| Sockets supported | BGA1288, PGA988 | PGA988 |
| Max CPU configuration | 1 | 1 |
| Package size | rPGA 37.5mmx 37.5mm, BGA 34mmx28mm | 37.5mm x 37.5mm |
| TJUNCTION | 105 °C | 100 °C |
| Die size | 81 mm² | 296 mm² |
| Transistors (millions) | 382 million | 774 million |
| 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 |
| vPro Eligibility | Intel vPro Platform | Intel vPro Platform |
| Technologies | ||
| Enhanced SpeedStep | Yes | Yes |
| Idle States | Yes | Yes |
| Thermal Monitoring Technologies | Yes | Yes |
| Flex Memory Access | Yes | — |
| Fast Memory Access | Yes | — |