i7-640LM vs Pentium D 820
Aggregate performance score
Core i7-640LM outperforms Pentium D 820 by a whopping 210% based on our aggregate benchmark results.
Primary details
Comparing Pentium D 820 and Core i7-640LM processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3084 | 2486 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | Pentium D | Intel Core i7 |
| Power efficiency | 0.31 | 3.63 |
| Architecture codename | Smithfield (2005) | Arrandale (2010−2011) |
| Release date | May 2005 (19 years ago) | 7 January 2010 (14 years ago) |
| Launch price (MSRP) | no data | $332 |
Detailed specifications
Pentium D 820 and Core i7-640LM basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.
| Physical cores | 2 (Dual-core) | 2 (Dual-core) |
| Threads | 2 | 4 |
| Base clock speed | 2.8 GHz | 2.13 GHz |
| Boost clock speed | 2.8 GHz | 2.93 GHz |
| Bus type | no data | DMI 1.0 |
| Bus rate | 800 MHz | 1 × 2.5 GT/s |
| Multiplier | no data | 16 |
| L1 cache | 28 KB | 64 KB (per core) |
| L2 cache | 2 MB | 256 KB (per core) |
| L3 cache | 0 KB | 4 MB (shared) |
| Chip lithography | 90 nm | 32 nm |
| Die size | 206 mm2 | 81+177 mm2 |
| Maximum core temperature | 64 °C | 105 °C |
| Number of transistors | 169 million | 382+177 Million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| VID voltage range | 1.2V-1.4V | no data |
Compatibility
Information on Pentium D 820 and Core i7-640LM compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.
| Number of CPUs in a configuration | 2 | 1 (Uniprocessor) |
| Socket | PLGA775 | BGA1288 |
| Power consumption (TDP) | 95 Watt | 25 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Pentium D 820 and Core i7-640LM. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2 |
| AES-NI | - | + |
| FMA | - | + |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | - | + |
| Turbo Boost Technology | - | + |
| Hyper-Threading Technology | - | + |
| Idle States | + | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Demand Based Switching | - | no data |
| PAE | 32 Bit | 36 Bit |
| FDI | no data | + |
| Fast Memory Access | no data | + |
| FSB parity | - | no data |
Security technologies
Pentium D 820 and Core i7-640LM technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Pentium D 820 and Core i7-640LM are enumerated here.
| VT-d | - | + |
| VT-x | - | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Pentium D 820 and Core i7-640LM. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR1, DDR2, DDR3 | DDR3-800, DDR3-1066 |
| Maximum memory size | no data | 8 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 17.051 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel HD Graphics for Previous Generation Intel Processors |
| Clear Video | no data | + |
| Clear Video HD | no data | + |
| Graphics max frequency | no data | 566 MHz |
Graphics interfaces
Available interfaces and connections of Pentium D 820 and Core i7-640LM integrated GPUs.
| Number of displays supported | no data | 2 |
Peripherals
Specifications and connection of peripherals supported by Pentium D 820 and Core i7-640LM.
| PCIe version | no data | 2.0 |
| PCI Express lanes | no data | 16 |
Synthetic benchmark performance
Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.
Combined synthetic benchmark score
This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
Passmark
Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.
3DMark06 CPU
3DMark06 is a discontinued DirectX 9 benchmark suite from Futuremark. Its CPU part contains two scenarios, one dedicated to artificial intelligence pathfinding, another to game physics using PhysX package.
Pros & cons summary
| Performance score | 0.31 | 0.96 |
| Threads | 2 | 4 |
| Chip lithography | 90 nm | 32 nm |
| Power consumption (TDP) | 95 Watt | 25 Watt |
i7-640LM has a 209.7% higher aggregate performance score, 100% more threads, a 181.3% more advanced lithography process, and 280% lower power consumption.
The Core i7-640LM is our recommended choice as it beats the Pentium D 820 in performance tests.
Note that Pentium D 820 is a desktop processor while Core i7-640LM is a notebook one.
Should you still have questions on choice between Pentium D 820 and Core i7-640LM, ask them in Comments section, and we shall answer.
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