i7-1255U vs Atom x5-E3940
Aggregate performance score
Core i7-1255U outperforms Atom x5-E3940 by a whopping 594% based on our aggregate benchmark results.
Primary details
Comparing Atom x5-E3940 and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2319 | 893 |
| Place by popularity | not in top-100 | 74 |
| Market segment | Laptop | Laptop |
| Series | 5x Intel Atom | Intel Alder Lake-M |
| Power efficiency | 11.58 | 53.60 |
| Architecture codename | Apollo Lake (2014−2016) | Alder Lake-U (2022) |
| Release date | 30 August 2014 (10 years ago) | 23 February 2022 (2 years ago) |
Detailed specifications
Atom x5-E3940 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 | 1.6 GHz | 1.7 GHz |
| Boost clock speed | 1.8 GHz | 4.7 GHz |
| L1 cache | 56K (per core) | 80K (per core) |
| L2 cache | 2 MB (shared) | 1.25 MB (per core) |
| L3 cache | 0 KB | 12 MB (shared) |
| Chip lithography | 14 nm | Intel 7 nm |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 103 °C | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
Compatibility
Information on Atom x5-E3940 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 (Uniprocessor) | 1 |
| Socket | Intel BGA 1296 | FCBGA1744 |
| Power consumption (TDP) | 10 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Atom x5-E3940 and Core i7-1255U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| FMA | - | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | + | + |
| Speed Shift | no data | + |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Deep Learning Boost | - | + |
Security technologies
Atom x5-E3940 and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | no data | + |
| Secure Key | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Atom x5-E3940 and Core i7-1255U are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Atom x5-E3940 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-1866 | DDR4, DDR5 |
| Maximum memory size | 8 GB | 64 GB |
| Max memory channels | no data | 2 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Intel HD Graphics 500 | Intel® Iris® Xe Graphics eligible |
| Quick Sync Video | - | + |
| Graphics max frequency | no data | 1.25 GHz |
| Execution Units | no data | 96 |
Graphics interfaces
Available interfaces and connections of Atom x5-E3940 and Core i7-1255U integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by Atom x5-E3940 and Core i7-1255U integrated GPUs, including resolutions over different interfaces.
| Max resolution over HDMI 1.4 | no data | 4096 x 2304 @ 60Hz |
| Max resolution over eDP | no data | 4096 x 2304 @ 120Hz |
| Max resolution over DisplayPort | no data | 7680 x 4320 @ 60Hz |
Graphics API support
APIs supported by Atom x5-E3940 and Core i7-1255U integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12.1 |
| OpenGL | no data | 4.6 |
Peripherals
Specifications and connection of peripherals supported by Atom x5-E3940 and Core i7-1255U.
| PCIe version | 2.0 | 4.0 |
| PCI Express lanes | 4 | 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 | 1.23 | 8.54 |
| Recency | 30 August 2014 | 23 February 2022 |
| Physical cores | 4 | 10 |
| Threads | 4 | 12 |
| Power consumption (TDP) | 10 Watt | 15 Watt |
Atom x5-E3940 has 50% lower power consumption.
i7-1255U, on the other hand, has a 594.3% higher aggregate performance score, an age advantage of 7 years, and 150% more physical cores and 200% more threads.
The Core i7-1255U is our recommended choice as it beats the Atom x5-E3940 in performance tests.
Should you still have questions on choice between Atom x5-E3940 and Core i7-1255U, ask them in Comments section, and we shall answer.
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