Ryzen 9 3900X vs Ryzen 9 9955HX
Aggregate performance score
Ryzen 9 9955HX outperforms Ryzen 9 3900X by an impressive 77% 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 | 116 | 313 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 20.41 |
| Market segment | Laptop | Desktop processor |
| Series | AMD Dragon Range (Zen 4, Ryzen 7045) | AMD Ryzen 9 |
| Power efficiency | 62.53 | 15.58 |
| Designer | AMD | AMD |
| Manufacturer | no data | TSMC |
| Architecture codename | Fire Range-HX (Zen 5) (2025) | Matisse (Zen 2) (2019−2020) |
| Release date | 6 January 2025 (less than a year ago) | 7 July 2019 (5 years ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
Ryzen 9 9955HX and Ryzen 9 3900X 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 | 16 (Hexadeca-Core) | 12 (Dodeca-Core) |
| Threads | 32 | 24 |
| Base clock speed | no data | 3.8 GHz |
| Boost clock speed | 5.4 GHz | 4.6 GHz |
| L1 cache | 1.3 MB | 96K (per core) |
| L2 cache | 16 MB | 512K (per core) |
| L3 cache | 64 MB | 64 MB |
| Chip lithography | no data | 7 nm, 12 nm |
| Maximum core temperature | no data | 95 °C |
| Number of transistors | no data | 19,200 million |
| 64 bit support | + | + |
| Windows 11 compatibility | no data | + |
| Unlocked multiplier | - | + |
Compatibility
Information on Ryzen 9 9955HX and Ryzen 9 3900X 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 (Uniprocessor) |
| Socket | no data | AM4 |
| Power consumption (TDP) | 55 Watt | 125 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 9955HX and Ryzen 9 3900X. You'll probably need this information if you require some particular technology.
| AES-NI | - | + |
| AVX | - | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 9955HX and Ryzen 9 3900X are enumerated here.
| AMD-V | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 9955HX and Ryzen 9 3900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR4 Dual-channel |
| Maximum memory size | no data | 128 GB |
| Max memory channels | no data | 2 |
| Maximum memory bandwidth | no data | 51.196 GB/s |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | AMD Radeon 610M ( - 2200 MHz) | - |
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
Pros & cons summary
| Performance score | 35.86 | 20.30 |
| Recency | 6 January 2025 | 7 July 2019 |
| Physical cores | 16 | 12 |
| Threads | 32 | 24 |
| Power consumption (TDP) | 55 Watt | 125 Watt |
Ryzen 9 9955HX has a 76.7% higher aggregate performance score, an age advantage of 5 years, 33.3% more physical cores and 33.3% more threads, and 127.3% lower power consumption.
The AMD Ryzen 9 9955HX is our recommended choice as it beats the AMD Ryzen 9 3900X in performance tests.
Be aware that Ryzen 9 9955HX is a notebook processor while Ryzen 9 3900X is a desktop one.
Other comparisons
We've compiled a selection of CPU comparisons, ranging from closely matched processors to other comparisons that may be of interest.
