Ryzen 9 9955HX vs EPYC 7643P
Aggregate performance score
EPYC 7643P outperforms Ryzen 9 9955HX by an impressive 70% 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 | 44 | 185 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 15.69 | no data |
| Market segment | Server | Laptop |
| Series | no data | AMD Dragon Range (Zen 4, Ryzen 7045) |
| Power efficiency | 20.52 | 49.39 |
| Designer | AMD | AMD |
| Manufacturer | TSMC | no data |
| Architecture codename | Milan (2021−2023) | Fire Range-HX (Zen 5) (2025) |
| Release date | 5 September 2023 (1 year ago) | 6 January 2025 (less than a year ago) |
| Launch price (MSRP) | $2,722 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
EPYC 7643P 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 | 48 (Octatetraconta-Core) | 16 (Hexadeca-Core) |
| Threads | 96 | 32 |
| Base clock speed | 2.3 GHz | no data |
| Boost clock speed | 3.6 GHz | 5.4 GHz |
| L1 cache | 64 KB (per core) | 1.3 MB |
| L2 cache | 512 KB (per core) | 16 MB |
| L3 cache | 256 MB (shared) | 64 MB |
| Chip lithography | 7 nm | no data |
| Die size | 8x 81 mm2 | no data |
| Number of transistors | 33,200 million | no data |
| 64 bit support | - | + |
Compatibility
Information on EPYC 7643P 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 | SP3 | no data |
| Power consumption (TDP) | 225 Watt | 55 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by EPYC 7643P and Ryzen 9 9955HX. 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 EPYC 7643P and Ryzen 9 9955HX are enumerated here.
| AMD-V | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by EPYC 7643P and Ryzen 9 9955HX. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | N/A | AMD Radeon 610M ( - 2200 MHz) |
Peripherals
Specifications and connection of peripherals supported by EPYC 7643P and Ryzen 9 9955HX.
| PCIe version | 4.0 | no data |
| PCI Express lanes | 128 | no data |
Pros & cons summary
| Performance score | 48.19 | 28.35 |
| Recency | 5 September 2023 | 6 January 2025 |
| Physical cores | 48 | 16 |
| Threads | 96 | 32 |
| Power consumption (TDP) | 225 Watt | 55 Watt |
EPYC 7643P has a 70% higher aggregate performance score, and 200% more physical cores and 200% more threads.
Ryzen 9 9955HX, on the other hand, has an age advantage of 1 year, and 309.1% lower power consumption.
The AMD EPYC 7643P is our recommended choice as it beats the AMD Ryzen 9 9955HX in performance tests.
Be aware that EPYC 7643P is a server/workstation 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.
