i7-1255U vs Ryzen 9 3900
Aggregate performance score
Ryzen 9 3900 outperforms Core i7-1255U by a whopping 127% based on our aggregate benchmark results.
Primary details
Comparing Ryzen 9 3900 and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 289 | 878 |
| Place by popularity | not in top-100 | 37 |
| Cost-effectiveness evaluation | 20.34 | no data |
| Market segment | Desktop processor | Laptop |
| Series | AMD Matisse (Ryzen 3000 Desktop) | Intel Alder Lake-M |
| Power efficiency | 28.23 | 53.98 |
| Architecture codename | Matisse (Zen 2) (2019−2020) | Alder Lake-U (2022) |
| Release date | 24 September 2019 (5 years ago) | 23 February 2022 (2 years ago) |
| Launch price (MSRP) | $499 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Ryzen 9 3900 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 | 12 (Dodeca-Core) | 10 (Deca-Core) |
| Threads | 24 | 12 |
| Base clock speed | 3.1 GHz | 1.7 GHz |
| Boost clock speed | 4.3 GHz | 4.7 GHz |
| L1 cache | 768 KB | 80K (per core) |
| L2 cache | 6 MB | 1.25 MB (per core) |
| L3 cache | 64 MB | 12 MB (shared) |
| Chip lithography | 7 nm, 12 nm | Intel 7 nm |
| Die size | 2x 74 mm2 | no data |
| Maximum core temperature | no data | 100 °C |
| Number of transistors | 7,600 million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 9 3900 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 | 1 |
| Socket | AM4 | FCBGA1744 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 3900 and Core i7-1255U. You'll probably need this information if you require some particular technology.
| Instruction set extensions | 86x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2 | Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2 |
| AES-NI | + | + |
| FMA | - | + |
| AVX | + | + |
| Enhanced SpeedStep (EIST) | no data | + |
| Speed Shift | no data | + |
| Hyper-Threading Technology | no data | + |
| TSX | - | + |
| Thermal Monitoring | - | + |
| Flex Memory Access | no data | + |
| Precision Boost 2 | + | no data |
| Deep Learning Boost | - | + |
Security technologies
Ryzen 9 3900 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 Ryzen 9 3900 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 Ryzen 9 3900 and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-3200 | DDR4, DDR5 |
| Maximum memory size | 128 GB | 64 GB |
| Max memory channels | 2 | 2 |
| Maximum memory bandwidth | 51.196 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | 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 Ryzen 9 3900 and Core i7-1255U integrated GPUs.
| Number of displays supported | no data | 4 |
Graphics image quality
Maximum display resolutions supported by Ryzen 9 3900 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 Ryzen 9 3900 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 Ryzen 9 3900 and Core i7-1255U.
| PCIe version | 4.0 | 4.0 |
| PCI Express lanes | 24 | 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.
Cinebench 15 64-bit multi-core
Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.
Cinebench 15 64-bit single-core
Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.
Geekbench 5.5 Multi-Core
Blender(-)
Geekbench 5.5 Single-Core
7-Zip Single
7-Zip
WebXPRT 3
Pros & cons summary
| Performance score | 20.12 | 8.88 |
| Recency | 24 September 2019 | 23 February 2022 |
| Physical cores | 12 | 10 |
| Threads | 24 | 12 |
| Power consumption (TDP) | 65 Watt | 15 Watt |
Ryzen 9 3900 has a 126.6% higher aggregate performance score, and 20% more physical cores and 100% more threads.
i7-1255U, on the other hand, has an age advantage of 2 years, and 333.3% lower power consumption.
The Ryzen 9 3900 is our recommended choice as it beats the Core i7-1255U in performance tests.
Note that Ryzen 9 3900 is a desktop processor while Core i7-1255U is a notebook one.
Should you still have questions on choice between Ryzen 9 3900 and Core i7-1255U, ask them in Comments section, and we shall answer.
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