Ryzen 7 7840U vs A6-6400B
Aggregate performance score
Ryzen 7 7840U outperforms A6-6400B by a whopping 1442% based on our aggregate benchmark results.
Primary details
Comparing A6-6400B and Ryzen 7 7840U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2446 | 427 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | AMD Phoenix (Zen 4, Ryzen 7040) |
| Power efficiency | 1.49 | 53.17 |
| Architecture codename | Richland (2013−2014) | Phoenix-U (Zen 4) (2023) |
| Release date | 1 June 2013 (11 years ago) | May 2023 (1 year ago) |
Detailed specifications
A6-6400B and Ryzen 7 7840U 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) | 8 (Octa-Core) |
| Threads | 2 | 16 |
| Base clock speed | 3.9 GHz | 3.3 GHz |
| Boost clock speed | 4.1 GHz | 5.1 GHz |
| L1 cache | 96K | 64K (per core) |
| L2 cache | 1 MB (shared) | 1 MB (per core) |
| L3 cache | no data | 16 MB (shared) |
| Chip lithography | 32 nm | 4 nm |
| Die size | 246 mm2 | 178 mm2 |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 70 °C | no data |
| Number of transistors | 1,303 million | 25,000 million |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | + |
| Unlocked multiplier | + | - |
Compatibility
Information on A6-6400B and Ryzen 7 7840U 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 | FM2 | FP8 |
| Power consumption (TDP) | 65 Watt | 28 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by A6-6400B and Ryzen 7 7840U. You'll probably need this information if you require some particular technology.
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| PowerNow | + | - |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by A6-6400B and Ryzen 7 7840U are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by A6-6400B and Ryzen 7 7840U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-1866 | DDR5-5600 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card Compare | AMD Radeon HD 8470D | AMD Radeon 780M |
Peripherals
Specifications and connection of peripherals supported by A6-6400B and Ryzen 7 7840U.
| PCIe version | 2.0 | 4.0 |
| PCI Express lanes | no data | 20 |
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 | 1.02 | 15.73 |
| Integrated graphics card | 0.97 | 18.31 |
| Physical cores | 2 | 8 |
| Threads | 2 | 16 |
| Chip lithography | 32 nm | 4 nm |
| Power consumption (TDP) | 65 Watt | 28 Watt |
Ryzen 7 7840U has a 1442.2% higher aggregate performance score, 1787.6% faster integrated GPU, 300% more physical cores and 700% more threads, a 700% more advanced lithography process, and 132.1% lower power consumption.
The Ryzen 7 7840U is our recommended choice as it beats the A6-6400B in performance tests.
Note that A6-6400B is a desktop processor while Ryzen 7 7840U is a notebook one.
Should you still have questions on choice between A6-6400B and Ryzen 7 7840U, ask them in Comments section, and we shall answer.
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