i7-1255U vs Phenom II X3 P820
Aggregate performance score
Core i7-1255U outperforms Phenom II X3 P820 by a whopping 1194% based on our aggregate benchmark results.
Primary details
Comparing Phenom II X3 P820 and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2738 | 881 |
| Place by popularity | not in top-100 | 37 |
| Market segment | Laptop | Laptop |
| Series | 3x AMD Phenom II | Intel Alder Lake-M |
| Power efficiency | 2.50 | 53.88 |
| Architecture codename | Champlain (2010−2011) | Alder Lake-U (2022) |
| Release date | 12 May 2010 (14 years ago) | 23 February 2022 (2 years ago) |
Detailed specifications
Phenom II X3 P820 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 | 3 (Tri-Core) | 10 (Deca-Core) |
| Threads | 3 | 12 |
| Base clock speed | no data | 1.7 GHz |
| Boost clock speed | 1.8 GHz | 4.7 GHz |
| Bus rate | 3600 MHz | no data |
| L1 cache | 384 KB | 80K (per core) |
| L2 cache | 1.5 MB | 1.25 MB (per core) |
| L3 cache | no data | 12 MB (shared) |
| Chip lithography | 45 nm | Intel 7 nm |
| Maximum core temperature | no data | 100 °C |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
Compatibility
Information on Phenom II X3 P820 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 | S1 | FCBGA1744 |
| Power consumption (TDP) | 25 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Phenom II X3 P820 and Core i7-1255U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Virtualization, AMD64, Advanced Virus Protection, SSE(1,2,3,4a) | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | - | + |
| FMA | - | + |
| AVX | - | + |
| VirusProtect | + | - |
| Enhanced SpeedStep (EIST) | no data | + |
| Speed Shift | no data | + |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Deep Learning Boost | - | + |
Security technologies
Phenom II X3 P820 and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | no data | + |
| EDB | no data | + |
| Secure Key | no data | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Phenom II X3 P820 and Core i7-1255U are enumerated here.
| AMD-V | + | - |
| VT-d | no data | + |
| VT-x | no data | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X3 P820 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | 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 Phenom II X3 P820 and Core i7-1255U integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by Phenom II X3 P820 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 Phenom II X3 P820 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 Phenom II X3 P820 and Core i7-1255U.
| PCIe version | no data | 4.0 |
| PCI Express lanes | no data | 20 |
Pros & cons summary
| Performance score | 0.66 | 8.54 |
| Recency | 12 May 2010 | 23 February 2022 |
| Physical cores | 3 | 10 |
| Threads | 3 | 12 |
| Power consumption (TDP) | 25 Watt | 15 Watt |
i7-1255U has a 1193.9% higher aggregate performance score, an age advantage of 11 years, 233.3% more physical cores and 300% more threads, and 66.7% lower power consumption.
The Core i7-1255U is our recommended choice as it beats the Phenom II X3 P820 in performance tests.
Should you still have questions on choice between Phenom II X3 P820 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.
