Ryzen 9 9900X vs A6-6420K
Aggregate performance score
Ryzen 9 9900X outperforms A6-6420K by a whopping 3369% based on our aggregate benchmark results.
Primary details
Comparing A6-6420K and Ryzen 9 9900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2460 | 108 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 63.46 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 1.45 | 27.24 |
| Architecture codename | Richland (2013−2014) | Granite Ridge (2024) |
| Release date | January 2014 (10 years ago) | 15 August 2024 (less than a year ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
A6-6420K and Ryzen 9 9900X 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) | 12 (Dodeca-Core) |
| Threads | 2 | 24 |
| Base clock speed | 4 GHz | 4.4 GHz |
| Boost clock speed | 4.2 GHz | 5.6 GHz |
| L1 cache | 96 KB | 80 KB (per core) |
| L2 cache | 1024 KB | 1 MB (per core) |
| L3 cache | no data | 64 MB (shared) |
| Chip lithography | 32 nm | 4 nm |
| Die size | 246 mm2 | 2x 70.6 mm2 |
| Maximum core temperature | 70 °C | 95 °C |
| Maximum case temperature (TCase) | 70 °C | no data |
| Number of transistors | 1,303 million | 16,630 million |
| 64 bit support | + | + |
| Unlocked multiplier | + | + |
Compatibility
Information on A6-6420K and Ryzen 9 9900X 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 | FM2 | AM5 |
| Power consumption (TDP) | 65 Watt | 120 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by A6-6420K and Ryzen 9 9900X. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | SMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A |
| AES-NI | + | + |
| FMA | + | - |
| AVX | + | + |
| PowerNow | + | - |
| PowerGating | + | - |
| VirusProtect | + | - |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by A6-6420K and Ryzen 9 9900X are enumerated here.
| AMD-V | + | + |
| IOMMU 2.0 | + | - |
Memory specs
Types, maximum amount and channel quantity of RAM supported by A6-6420K and Ryzen 9 9900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-1866 | DDR5 |
| Max memory channels | 2 | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card Compare | AMD Radeon HD 8470D | AMD Radeon Graphics |
| Number of pipelines | 192 | no data |
| Enduro | + | - |
| Switchable graphics | + | - |
| UVD | + | - |
Graphics interfaces
Available interfaces and connections of A6-6420K and Ryzen 9 9900X integrated GPUs.
| DisplayPort | + | - |
| HDMI | + | - |
Graphics API support
APIs supported by A6-6420K and Ryzen 9 9900X integrated GPUs, sometimes API versions are included.
| DirectX | DirectX® 11 | no data |
Peripherals
Specifications and connection of peripherals supported by A6-6420K and Ryzen 9 9900X.
| PCIe version | 2.0 | 5.0 |
| PCI Express lanes | no data | 24 |
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.
Pros & cons summary
| Performance score | 1.00 | 34.69 |
| Integrated graphics card | 0.97 | 1.98 |
| Physical cores | 2 | 12 |
| Threads | 2 | 24 |
| Chip lithography | 32 nm | 4 nm |
| Power consumption (TDP) | 65 Watt | 120 Watt |
A6-6420K has 84.6% lower power consumption.
Ryzen 9 9900X, on the other hand, has a 3369% higher aggregate performance score, 104.1% faster integrated GPU, 500% more physical cores and 1100% more threads, and a 700% more advanced lithography process.
The Ryzen 9 9900X is our recommended choice as it beats the A6-6420K in performance tests.
Should you still have questions on choice between A6-6420K and Ryzen 9 9900X, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
