Ryzen 9 9900X vs Athlon X4 845
Aggregate performance score
Ryzen 9 9900X outperforms Athlon X4 845 by a whopping 1338% based on our aggregate benchmark results.
Primary details
Comparing Athlon X4 845 and Ryzen 9 9900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1758 | 107 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 66.43 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 3.49 | 27.15 |
| Architecture codename | Carrizo (2015−2018) | Granite Ridge (2024) |
| Release date | 2 February 2016 (8 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
Athlon X4 845 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 | 4 (Quad-Core) | 12 (Dodeca-Core) |
| Threads | 4 | 24 |
| Base clock speed | 3.5 GHz | 4.4 GHz |
| Boost clock speed | 3.8 GHz | 5.6 GHz |
| L1 cache | 320K | 80 KB (per core) |
| L2 cache | 2 MB | 1 MB (per core) |
| L3 cache | no data | 64 MB (shared) |
| Chip lithography | 28 nm | 4 nm |
| Die size | 250 mm2 | 2x 70.6 mm2 |
| Maximum core temperature | no data | 95 °C |
| Maximum case temperature (TCase) | 74 °C | no data |
| Number of transistors | 3,100 million | 16,630 million |
| 64 bit support | + | + |
| Unlocked multiplier | + | + |
Compatibility
Information on Athlon X4 845 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 Athlon X4 845 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 | + | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Athlon X4 845 and Ryzen 9 9900X are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Athlon X4 845 and Ryzen 9 9900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3-2133 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | AMD Radeon Graphics |
Peripherals
Specifications and connection of peripherals supported by Athlon X4 845 and Ryzen 9 9900X.
| PCIe version | 3.0 | 5.0 |
| PCI Express lanes | 8 | 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 | 2.49 | 35.80 |
| Recency | 2 February 2016 | 15 August 2024 |
| Physical cores | 4 | 12 |
| Threads | 4 | 24 |
| Chip lithography | 28 nm | 4 nm |
| Power consumption (TDP) | 65 Watt | 120 Watt |
Athlon X4 845 has 84.6% lower power consumption.
Ryzen 9 9900X, on the other hand, has a 1337.8% higher aggregate performance score, an age advantage of 8 years, 200% more physical cores and 500% more threads, and a 600% more advanced lithography process.
The Ryzen 9 9900X is our recommended choice as it beats the Athlon X4 845 in performance tests.
Should you still have questions on choice between Athlon X4 845 and Ryzen 9 9900X, ask them in Comments section, and we shall answer.
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