i7-1255U vs Xeon E5440
Aggregate performance score
Core i7-1255U outperforms Xeon E5440 by a whopping 469% based on our aggregate benchmark results.
Primary details
Comparing Xeon E5440 and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2143 | 885 |
| Place by popularity | not in top-100 | 37 |
| Market segment | Server | Laptop |
| Series | no data | Intel Alder Lake-M |
| Power efficiency | 1.77 | 53.88 |
| Architecture codename | no data | Alder Lake-U (2022) |
| Release date | 1 January 2008 (16 years ago) | 23 February 2022 (2 years ago) |
Detailed specifications
Xeon E5440 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 | no data | 10 (Deca-Core) |
| Threads | no data | 12 |
| Base clock speed | 2.83 GHz | 1.7 GHz |
| Boost clock speed | no data | 4.7 GHz |
| L1 cache | no data | 80K (per core) |
| L2 cache | no data | 1.25 MB (per core) |
| L3 cache | 12 MB L2 Cache | 12 MB (shared) |
| Chip lithography | 45 nm | Intel 7 nm |
| Maximum core temperature | 67 °C | 100 °C |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| VID voltage range | 0.85V-1.35V | no data |
Compatibility
Information on Xeon E5440 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 | no data | 1 |
| Socket | LGA771 | FCBGA1744 |
| Power consumption (TDP) | 80 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon E5440 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 | + |
| Turbo Boost Technology | - | no data |
| Hyper-Threading Technology | - | + |
| TSX | - | + |
| Idle States | + | no data |
| Thermal Monitoring | + | + |
| Flex Memory Access | no data | + |
| Demand Based Switching | + | no data |
| FSB parity | + | no data |
| Deep Learning Boost | - | + |
Security technologies
Xeon E5440 and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | + |
| Secure Key | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon E5440 and Core i7-1255U are enumerated here.
| VT-d | no data | + |
| VT-x | + | + |
| EPT | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon E5440 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR4, DDR5 |
| Maximum memory size | no data | 64 GB |
| Max memory channels | no data | 2 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | 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 Xeon E5440 and Core i7-1255U integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by Xeon E5440 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 Xeon E5440 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 Xeon E5440 and Core i7-1255U.
| PCIe version | no data | 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 | 1.50 | 8.54 |
| Recency | 1 January 2008 | 23 February 2022 |
| Power consumption (TDP) | 80 Watt | 15 Watt |
i7-1255U has a 469.3% higher aggregate performance score, an age advantage of 14 years, and 433.3% lower power consumption.
The Core i7-1255U is our recommended choice as it beats the Xeon E5440 in performance tests.
Be aware that Xeon E5440 is a server/workstation processor while Core i7-1255U is a notebook one.
Should you still have questions on choice between Xeon E5440 and Core i7-1255U, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
