i7-1255U vs Athlon X4 840
Aggregate performance score
Core i7-1255U outperforms Athlon X4 840 by a whopping 308% based on our aggregate benchmark results.
Primary details
Comparing Athlon X4 840 and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1890 | 896 |
| Place by popularity | not in top-100 | 74 |
| Market segment | Desktop processor | Laptop |
| Series | 4x Athlon | Intel Alder Lake-M |
| Power efficiency | 3.04 | 53.78 |
| Architecture codename | Kaveri (2014−2015) | Alder Lake-U (2022) |
| Release date | August 2014 (10 years ago) | 23 February 2022 (2 years ago) |
Detailed specifications
Athlon X4 840 and Core i7-1255U 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) | 10 (Deca-Core) |
| Threads | 4 | 12 |
| Base clock speed | 3.1 GHz | 1.7 GHz |
| Boost clock speed | 3.8 GHz | 4.7 GHz |
| L1 cache | 256K | 80K (per core) |
| L2 cache | 4 MB | 1.25 MB (per core) |
| L3 cache | no data | 12 MB (shared) |
| Chip lithography | 28 nm | 10 nm |
| Die size | 245 mm2 | no data |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 72 °C | no data |
| Number of transistors | 2,411 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | + | - |
Compatibility
Information on Athlon X4 840 and Core i7-1255U 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 | Socket FM2+ | Intel BGA 1744 |
| Power consumption (TDP) | 65 watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Athlon X4 840 and Core i7-1255U. You'll probably need this information if you require some particular technology.
| AES-NI | + | + |
| FMA | + | + |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | no data | + |
| TSX | - | + |
Security technologies
Athlon X4 840 and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon X4 840 and Core i7-1255U are enumerated here.
| AMD-V | + | - |
| VT-d | no data | + |
| VT-x | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon X4 840 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR4, DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel Iris Xe Graphics G7 96EUs ( - 1250 MHz) |
Peripherals
Specifications and connection of peripherals supported by Athlon X4 840 and Core i7-1255U.
| PCIe version | 3.0 | 4.0 |
| PCI Express lanes | 16 | 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 | 2.09 | 8.53 |
| Recency | on August 2014 | 23 February 2022 |
| Physical cores | 4 | 10 |
| Threads | 4 | 12 |
| Chip lithography | 28 nm | 10 nm |
| Power consumption (TDP) | 65 Watt | 15 Watt |
i7-1255U has a 308.1% higher aggregate performance score, an age advantage of 7 years, 150% more physical cores and 200% more threads, a 180% more advanced lithography process, and 333.3% lower power consumption.
The Core i7-1255U is our recommended choice as it beats the Athlon X4 840 in performance tests.
Note that Athlon X4 840 is a desktop processor while Core i7-1255U is a notebook one.
Should you still have questions on choice between Athlon X4 840 and Core i7-1255U, ask them in Comments section, and we shall answer.
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