Ryzen 9 9900X vs i7-1255U
Aggregate performance score
Ryzen 9 9900X outperforms Core i7-1255U by a whopping 305% based on our aggregate benchmark results.
Primary details
Comparing Core i7-1255U and Ryzen 9 9900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 911 | 115 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 67.22 |
| Market segment | Laptop | Desktop processor |
| Series | Intel Alder Lake-M | no data |
| Power efficiency | 53.68 | 27.20 |
| Architecture codename | Alder Lake-U (2022) | Granite Ridge (2024−2025) |
| Release date | 23 February 2022 (2 years ago) | 15 August 2024 (less than a year ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Core i7-1255U and Ryzen 9 9900X 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 | 10 (Deca-Core) | 12 (Dodeca-Core) |
| Threads | 12 | 24 |
| Base clock speed | 1.7 GHz | 4.4 GHz |
| Boost clock speed | 4.7 GHz | 5.6 GHz |
| L1 cache | 80K (per core) | 80 KB (per core) |
| L2 cache | 1.25 MB (per core) | 1 MB (per core) |
| L3 cache | 12 MB (shared) | 64 MB (shared) |
| Chip lithography | 10 nm | 4 nm |
| Die size | no data | 2x 70.6 mm2 |
| Maximum core temperature | 100 °C | 95 °C |
| Number of transistors | no data | 16,630 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on Core i7-1255U and Ryzen 9 9900X 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 | Intel BGA 1744 | AM5 |
| Power consumption (TDP) | 15 Watt | 120 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Core i7-1255U and Ryzen 9 9900X. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | SMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A |
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | + | no data |
| TSX | + | - |
| Precision Boost 2 | no data | + |
Security technologies
Core i7-1255U and Ryzen 9 9900X technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Core i7-1255U and Ryzen 9 9900X 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 Core i7-1255U and Ryzen 9 9900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4, DDR5 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card Compare | Intel Iris Xe Graphics G7 96EUs ( - 1250 MHz) | AMD Radeon Graphics |
Peripherals
Specifications and connection of peripherals supported by Core i7-1255U and Ryzen 9 9900X.
| PCIe version | 4.0 | 5.0 |
| PCI Express lanes | 20 | 24 |
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.
Geekbench 5.5 Multi-Core
Blender(-)
Geekbench 5.5 Single-Core
7-Zip Single
7-Zip
WebXPRT 3
CrossMark Overall
WebXPRT 4 Overall
Blender v3.3 Classroom CPU(-)
Geekbench 6.3 Multi-Core
Geekbench 6.3 Single-Core
Pros & cons summary
| Performance score | 8.45 | 34.25 |
| Integrated graphics card | 8.83 | 1.90 |
| Recency | 23 February 2022 | 15 August 2024 |
| Physical cores | 10 | 12 |
| Threads | 12 | 24 |
| Chip lithography | 10 nm | 4 nm |
| Power consumption (TDP) | 15 Watt | 120 Watt |
i7-1255U has 364.7% faster integrated GPU, and 700% lower power consumption.
Ryzen 9 9900X, on the other hand, has a 305.3% higher aggregate performance score, an age advantage of 2 years, 20% more physical cores and 100% more threads, and a 150% more advanced lithography process.
The Ryzen 9 9900X is our recommended choice as it beats the Core i7-1255U in performance tests.
Be aware that Core i7-1255U is a notebook processor while Ryzen 9 9900X is a desktop one.
Should you still have questions on choice between Core i7-1255U and Ryzen 9 9900X, ask them in Comments section, and we shall answer.
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