Ryzen 9 9955HX vs Ryzen 9 7900X
Aggregate performance score
Ryzen 9 9955HX outperforms Ryzen 9 7900X by a moderate 12% 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 | 176 | 136 |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Laptop |
| Series | no data | AMD Dragon Range (Zen 4, Ryzen 7045) |
| Power efficiency | 7.27 | 25.11 |
| Designer | AMD | AMD |
| Manufacturer | TSMC | no data |
| Architecture codename | Raphael (Zen4) (2022−2023) | Fire Range-HX (Zen 5) (2025) |
| Release date | 27 September 2022 (2 years ago) | 6 January 2025 (less than a year ago) |
Detailed specifications
Ryzen 9 7900X and Ryzen 9 9955HX 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) | 16 (Hexadeca-Core) |
| Threads | 24 | 32 |
| Base clock speed | 4.7 GHz | no data |
| Boost clock speed | 5.6 GHz | 5.4 GHz |
| L1 cache | 64K (per core) | 1.3 MB |
| L2 cache | 1 MB (per core) | 16 MB |
| L3 cache | 64 MB (shared) | 64 MB |
| Chip lithography | 5 nm | no data |
| Die size | 2x 70 (CCD) mm2 + 122 (I/O) mm2 | no data |
| Maximum core temperature | 95 °C | no data |
| Maximum case temperature (TCase) | 47 °C | no data |
| Number of transistors | CCD: 6,5 Mrd + IOD: 3,4 Mrd Million | no data |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 9 7900X and Ryzen 9 9955HX 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 | no data |
| Socket | AM5 | no data |
| Power consumption (TDP) | 170 Watt | 55 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 7900X and Ryzen 9 9955HX. You'll probably need this information if you require some particular technology.
| Instruction set extensions | 5 nm (CCD), 6 nm (I/O) nm, 0.650 - 1.475V | no data |
| AES-NI | + | - |
| AVX | + | - |
| Precision Boost 2 | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 7900X and Ryzen 9 9955HX are enumerated here.
| AMD-V | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 7900X and Ryzen 9 9955HX. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5-5200 | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | AMD Radeon Graphics (Ryzen 7000) | AMD Radeon 610M ( - 2200 MHz) |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 7900X and Ryzen 9 9955HX.
| PCIe version | 5.0 | no data |
| PCI Express lanes | 24 | no data |
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.
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.
Geekbench 5.5 Multi-Core
7-Zip Single
7-Zip
CrossMark Overall
WebXPRT 4 Overall
Blender v3.3 Classroom CPU(-)
Geekbench 6.4 Multi-Core
Geekbench 6.4 Single-Core
Pros & cons summary
| Performance score | 29.19 | 32.62 |
| Integrated graphics card | 4.05 | 2.63 |
| Recency | 27 September 2022 | 6 January 2025 |
| Physical cores | 12 | 16 |
| Threads | 24 | 32 |
| Power consumption (TDP) | 170 Watt | 55 Watt |
Ryzen 9 7900X has 54% faster integrated GPU.
Ryzen 9 9955HX, on the other hand, has a 11.8% higher aggregate performance score, an age advantage of 2 years, 33.3% more physical cores and 33.3% more threads, and 209.1% lower power consumption.
The AMD Ryzen 9 9955HX is our recommended choice as it beats the AMD Ryzen 9 7900X in performance tests.
Note that Ryzen 9 7900X is a desktop processor while Ryzen 9 9955HX is a notebook one.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
