Ryzen Threadripper PRO 9955WX vs A9-9420
Aggregate performance score
Ryzen Threadripper PRO 9955WX outperforms A9-9420 by a whopping 4439% 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 | 2707 | 71 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 26.83 |
| Market segment | Laptop | Desktop processor |
| Series | AMD Bristol Ridge | no data |
| Power efficiency | 2.47 | 4.81 |
| Designer | AMD | AMD |
| Manufacturer | GlobalFoundries | TSMC |
| Architecture codename | Stoney Ridge (2016−2019) | Shimada Peak (2025) |
| Release date | 31 May 2016 (9 years ago) | 23 July 2025 (recently) |
| Launch price (MSRP) | no data | $1,649 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Performance to price scatter graph
Detailed specifications
A9-9420 and Ryzen Threadripper PRO 9955WX 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 | 2 (Dual-core) | 16 (Hexadeca-Core) |
| Threads | 2 | 32 |
| Base clock speed | 3 GHz | 4.5 GHz |
| Boost clock speed | 3.6 GHz | 5.4 GHz |
| L1 cache | 160 KB | 64 KB (per core) |
| L2 cache | 1 MB (shared) | 1 MB (per core) |
| L3 cache | 0 KB | 64 MB (shared) |
| Chip lithography | 28 nm | 4 nm |
| Die size | 125 mm2 | 2x 70.6 mm2 |
| Maximum core temperature | 90 °C | no data |
| Maximum case temperature (TCase) | 74 °C | no data |
| Number of transistors | 1,200 million | 16,630 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on A9-9420 and Ryzen Threadripper PRO 9955WX 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 | FT4 | sTR5 |
| Power consumption (TDP) | 15 Watt | 350 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by A9-9420 and Ryzen Threadripper PRO 9955WX. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Virtualization, | no data |
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by A9-9420 and Ryzen Threadripper PRO 9955WX are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by A9-9420 and Ryzen Threadripper PRO 9955WX. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | Radeon R5 | N/A |
Peripherals
Specifications and connection of peripherals supported by A9-9420 and Ryzen Threadripper PRO 9955WX.
| PCIe version | 3.0 | 5.0 |
| PCI Express lanes | 8 | 136 |
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.
Pros & cons summary
| Performance score | 0.88 | 39.94 |
| Recency | 31 May 2016 | 23 July 2025 |
| Physical cores | 2 | 16 |
| Threads | 2 | 32 |
| Chip lithography | 28 nm | 4 nm |
| Power consumption (TDP) | 15 Watt | 350 Watt |
A9-9420 has 2233.3% lower power consumption.
Ryzen Threadripper PRO 9955WX, on the other hand, has a 4438.6% higher aggregate performance score, an age advantage of 9 years, 700% more physical cores and 1500% more threads, and a 600% more advanced lithography process.
The AMD Ryzen Threadripper PRO 9955WX is our recommended choice as it beats the AMD A9-9420 in performance tests.
Be aware that A9-9420 is a notebook processor while Ryzen Threadripper PRO 9955WX is a desktop one.
Other comparisons
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