Ultra 7 255U vs Celeron M 420
Aggregate performance score
Core Ultra 7 255U outperforms Celeron M 420 by a whopping 12538% based on our aggregate benchmark results.
Contents
Primary details
Comparing processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 3678 | 893 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Laptop |
| Series | Celeron M | no data |
| Designer | Intel | Intel |
| Architecture codename | Yonah (2005−2006) | Arrow Lake-U (2025) |
| Release date | no data | 1 January 2025 (less than a year ago) |
Detailed specifications
Celeron M 420 and Core Ultra 7 255U 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 | 1 (Single-Core) | 12 (Dodeca-Core) |
| Performance-cores | no data | 2 |
| Efficient-cores | no data | 8 |
| Low Power Efficient-cores | no data | 2 |
| Threads | 1 | 14 |
| Base clock speed | 1.6 GHz | 3.8 GHz |
| Boost clock speed | 1.6 GHz | 5.2 GHz |
| Bus rate | 533 MHz | no data |
| L3 cache | 1 MB L2 KB | 12 MB |
| Chip lithography | 65 nm | 5 nm |
| Maximum core temperature | 100 °C | 110 °C |
| 64 bit support | - | + |
| Windows 11 compatibility | - | no data |
| VID voltage range | 1.0V-1.3V | no data |
Compatibility
Information on Celeron M 420 and Core Ultra 7 255U 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.
| Socket | PPGA478 | FCBGA2049 |
| Power consumption (TDP) | 27 Watt | 14 MB + 12 MB |
Technologies and extensions
Technological solutions and additional instructions supported by Celeron M 420 and Core Ultra 7 255U. 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 | - | + |
| AVX | - | + |
| Enhanced SpeedStep (EIST) | - | + |
| Speed Shift | no data | + |
| Turbo Boost Technology | - | 2.0 |
| Hyper-Threading Technology | - | + |
| Idle States | - | no data |
| Thermal Monitoring | - | + |
| Demand Based Switching | - | no data |
| Turbo Boost Max 3.0 | no data | - |
| FSB parity | - | no data |
| Deep Learning Boost | - | + |
| Supported AI Software Frameworks | - | OpenVINO™, WindowsML, ONNX RT |
Security technologies
Celeron M 420 and Core Ultra 7 255U technologies aimed at improving security, for example, by protecting against hacks.
| TXT | - | + |
| EDB | + | + |
| OS Guard | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Celeron M 420 and Core Ultra 7 255U are enumerated here.
| VT-d | no data | + |
| VT-x | - | + |
| EPT | no data | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Celeron M 420 and Core Ultra 7 255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR5 |
| Maximum memory size | no data | 128 GB |
| Max memory channels | no data | 2 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | Intel® Graphics |
| Quick Sync Video | - | + |
| Graphics max frequency | no data | 2.1 GHz |
Graphics interfaces
Available interfaces and connections of Celeron M 420 and Core Ultra 7 255U integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by Celeron M 420 and Core Ultra 7 255U integrated GPUs, including resolutions over different interfaces.
| Max resolution over HDMI 1.4 | no data | 4096 x 2304 @ 60Hz (HDMI 2.1 TMDS)7680 x 4320 @ 60Hz (HDMI 2.1 FRL) |
| Max resolution over eDP | no data | 3840 x 2400 @ 120Hz |
| Max resolution over DisplayPort | no data | 7680 x 4320 @ 60Hz |
Graphics API support
APIs supported by Celeron M 420 and Core Ultra 7 255U integrated GPUs, sometimes API versions are included.
| DirectX | no data | 12.2 |
| OpenGL | no data | 4.6 |
Peripherals
Specifications and connection of peripherals supported by Celeron M 420 and Core Ultra 7 255U.
| PCIe version | no data | 4.0 |
| PCI Express lanes | no data | 20 |
Synthetic benchmarks
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.
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. Other than that, Passmark measures multi-core performance.
Pros & cons summary
| Performance score | 0.08 | 10.11 |
| Physical cores | 1 | 12 |
| Threads | 1 | 14 |
| Chip lithography | 65 nm | 5 nm |
| Power consumption (TDP) | 27 Watt | 14 Watt |
Ultra 7 255U has a 12537.5% higher aggregate performance score, 1100% more physical cores and 1300% more threads, a 1200% more advanced lithography process, and 92.9% lower power consumption.
The Intel Core Ultra 7 255U is our recommended choice as it beats the Intel Celeron M 420 in performance tests.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
