Athlon II X4 638 vs i7-940XM
Aggregate performance score
Athlon II X4 638 outperforms Core i7-940XM by a minimal 2% based on our aggregate benchmark results.
Primary details
Comparing Core i7-940XM and Athlon II X4 638 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2213 | 2191 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Desktop processor |
| Series | Intel Core i7 | no data |
| Power efficiency | 2.39 | 2.07 |
| Architecture codename | Clarksfield (2009−2010) | Llano (2011−2012) |
| Release date | 20 June 2010 (14 years ago) | 6 February 2012 (12 years ago) |
| Launch price (MSRP) | $1,096 | no data |
Detailed specifications
Core i7-940XM and Athlon II X4 638 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 | 4 (Quad-Core) | 4 (Quad-Core) |
| Threads | 8 | 4 |
| Base clock speed | 2.13 GHz | 2.7 GHz |
| Boost clock speed | 3.33 GHz | 2.7 GHz |
| Bus rate | 2500 MHz | no data |
| L1 cache | 64 KB (per core) | 128 KB (per core) |
| L2 cache | 256 KB (per core) | 1 MB (per core) |
| L3 cache | 8 MB (shared) | 0 KB |
| Chip lithography | 45 nm | 32 nm |
| Die size | 296 mm2 | 228 mm2 |
| Maximum core temperature | 100 °C | no data |
| Number of transistors | 774 million | 1,178 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | + | - |
Compatibility
Information on Core i7-940XM and Athlon II X4 638 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 | 1 | 1 |
| Socket | FCPGA988,PGA988 | FM1 |
| Power consumption (TDP) | 55 Watt | 65 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i7-940XM and Athlon II X4 638. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2 | no data |
| Enhanced SpeedStep (EIST) | + | no data |
| Turbo Boost Technology | + | no data |
| Hyper-Threading Technology | + | no data |
| Idle States | + | no data |
| Thermal Monitoring | + | - |
| Demand Based Switching | - | no data |
| PAE | 36 Bit | no data |
Security technologies
Core i7-940XM and Athlon II X4 638 technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | no data |
| EDB | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i7-940XM and Athlon II X4 638 are enumerated here.
| AMD-V | - | + |
| VT-d | + | no data |
| VT-x | + | no data |
| EPT | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Core i7-940XM and Athlon II X4 638. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-1066, DDR3-1333 | DDR3 |
| Maximum memory size | 8 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 21 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | None | no data |
Peripherals
Specifications and connection of peripherals supported by Core i7-940XM and Athlon II X4 638.
| PCIe version | 2 | no data |
| PCI Express lanes | 16 | no data |
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.
Pros & cons summary
| Performance score | 1.39 | 1.42 |
| Recency | 20 June 2010 | 6 February 2012 |
| Threads | 8 | 4 |
| Chip lithography | 45 nm | 32 nm |
| Power consumption (TDP) | 55 Watt | 65 Watt |
i7-940XM has 100% more threads, and 18.2% lower power consumption.
Athlon II X4 638, on the other hand, has a 2.2% higher aggregate performance score, an age advantage of 1 year, and a 40.6% more advanced lithography process.
Given the minimal performance differences, no clear winner can be declared between Core i7-940XM and Athlon II X4 638.
Be aware that Core i7-940XM is a notebook processor while Athlon II X4 638 is a desktop one.
Should you still have questions on choice between Core i7-940XM and Athlon II X4 638, ask them in Comments section, and we shall answer.
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