i5-661 vs Athlon II X4 638
Aggregate performance score
Core i5-661 outperforms Athlon II X4 638 by a small 9% based on our aggregate benchmark results.
Primary details
Comparing Athlon II X4 638 and Core i5-661 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2191 | 2110 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 0.08 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 2.07 | 1.69 |
| Architecture codename | Llano (2011−2012) | Clarkdale (2010−2011) |
| Release date | 6 February 2012 (12 years ago) | 7 January 2010 (14 years ago) |
| Launch price (MSRP) | no data | $252 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Athlon II X4 638 and Core i5-661 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) | 2 (Dual-core) |
| Threads | 4 | 4 |
| Base clock speed | 2.7 GHz | 3.33 GHz |
| Boost clock speed | 2.7 GHz | 3.6 GHz |
| Bus rate | no data | 2.5 GT/s |
| L1 cache | 128 KB (per core) | 64 KB (per core) |
| L2 cache | 1 MB (per core) | 256 KB (per core) |
| L3 cache | 0 KB | 4 MB (shared) |
| Chip lithography | 32 nm | 32 nm |
| Die size | 228 mm2 | 81 mm2 |
| Maximum core temperature | no data | 70 °C |
| Number of transistors | 1,178 million | 382 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Athlon II X4 638 and Core i5-661 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 | FM1 | FCLGA1156 |
| Power consumption (TDP) | 65 Watt | 87 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon II X4 638 and Core i5-661. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.2 |
| AES-NI | - | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Turbo Boost Technology | no data | 1.0 |
| Hyper-Threading Technology | no data | + |
| Idle States | no data | + |
| Demand Based Switching | no data | - |
| PAE | no data | 36 Bit |
| FDI | no data | + |
Security technologies
Athlon II X4 638 and Core i5-661 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 Athlon II X4 638 and Core i5-661 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 Athlon II X4 638 and Core i5-661. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
| Maximum memory size | no data | 16.38 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 21 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 HD | no data | + |
Graphics interfaces
Available interfaces and connections of Athlon II X4 638 and Core i5-661 integrated GPUs.
| Number of displays supported | no data | 2 |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 638 and Core i5-661.
| 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.
Pros & cons summary
| Performance score | 1.42 | 1.55 |
| Recency | 6 February 2012 | 7 January 2010 |
| Physical cores | 4 | 2 |
| Power consumption (TDP) | 65 Watt | 87 Watt |
Athlon II X4 638 has an age advantage of 2 years, 100% more physical cores, and 33.8% lower power consumption.
i5-661, on the other hand, has a 9.2% higher aggregate performance score.
Given the minimal performance differences, no clear winner can be declared between Athlon II X4 638 and Core i5-661.
Should you still have questions on choice between Athlon II X4 638 and Core i5-661, ask them in Comments section, and we shall answer.
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