Athlon II X4 640 vs Athlon II X4 638
Aggregated performance score
Athlon II X4 638 outperforms Athlon II X4 640 by 1% based on our aggregated benchmark results.
General info
Comparing Athlon II X4 638 and Athlon II X4 640 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in performance ranking | 2052 | 2060 |
| Place by popularity | not in top-100 | not in top-100 |
| Value for money | 2.05 | 2.92 |
| Market segment | Desktop processor | Desktop processor |
| Architecture codename | Llano (2011−2012) | Propus (2009−2011) |
| Release date | 6 February 2012 (12 years old) | 11 May 2010 (13 years old) |
| Launch price (MSRP) | no data | $80 |
| Current price | $27 | $67 (0.8x MSRP) |
Value for money
Performance per price, higher is better.
Athlon II X4 640 has 42% better value for money than Athlon II X4 638.
Technical specs
Athlon II X4 638 and Athlon II X4 640 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 | 4 | 4 |
| Base clock speed | 2.7 GHz | 3 GHz |
| Boost clock speed | 2.7 GHz | 3 GHz |
| L1 cache | 128 KB (per core) | 128 KB (per core) |
| L2 cache | 1 MB (per core) | 512 KB (per core) |
| L3 cache | 0 KB | 0 KB |
| Chip lithography | 32 nm | 45 nm |
| Die size | 228 mm2 | 169 mm2 |
| Number of transistors | 1,178 million | 300 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
| Unlocked multiplier | No | No |
Compatibility
Information on Athlon II X4 638 and Athlon II X4 640 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 | AM3 |
| Power consumption (TDP) | 65 Watt | 95 Watt |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon II X4 638 and Athlon II X4 640 are enumerated here.
| AMD-V | + | no data |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon II X4 638 and Athlon II X4 640. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
Peripherals
Specifications and connection of peripherals supported by Athlon II X4 638 and Athlon II X4 640.
| PCIe version | no data | 2.0 |
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.
Athlon II X4 638 outperforms Athlon II X4 640 by 1% based on our aggregated benchmark results.
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.
Benchmark coverage: 68%
Athlon II X4 638 outperforms Athlon II X4 640 by 1% in Passmark.
Advantages and disadvantages
| Performance score | 1.47 | 1.46 |
| Recency | 6 February 2012 | 11 May 2010 |
| Chip lithography | 32 nm | 45 nm |
| Power consumption (TDP) | 65 Watt | 95 Watt |
We couldn't decide between Athlon II X4 638 and Athlon II X4 640. The differences in performance seem too small.
Should you still have questions on choice between Athlon II X4 638 and Athlon II X4 640, ask them in Comments section, and we shall answer.
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