Ryzen 9 3900X vs Phenom II X4 945 (125W)
Primary details
Comparing Phenom II X4 945 (125W) and Ryzen 9 3900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 267 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 21.73 |
| Market segment | Desktop processor | Desktop processor |
| Series | no data | AMD Ryzen 9 |
| Power efficiency | no data | 18.51 |
| Architecture codename | Deneb (2009−2011) | Matisse (Zen 2) (2019−2020) |
| Release date | 23 April 2009 (15 years ago) | 7 July 2019 (5 years ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Phenom II X4 945 (125W) 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 | 4 (Quad-Core) | 12 (Dodeca-Core) |
| Threads | 4 | 24 |
| Base clock speed | 3 GHz | 3.8 GHz |
| Boost clock speed | 3 GHz | 4.6 GHz |
| L1 cache | 128 KB (per core) | 768 KB |
| L2 cache | 512 KB (per core) | 6 MB |
| L3 cache | 6 MB (shared) | 64 MB |
| Chip lithography | 45 nm | 7 nm, 12 nm |
| Die size | 258 mm2 | no data |
| Maximum core temperature | no data | 95 °C |
| Number of transistors | 758 million | 19,200 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | + |
| Unlocked multiplier | - | + |
Compatibility
Information on Phenom II X4 945 (125W) 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 | 1 | 1 (Uniprocessor) |
| Socket | AM3 | AM4 |
| Power consumption (TDP) | 125 Watt | 105 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Phenom II X4 945 (125W) 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 Phenom II X4 945 (125W) and Ryzen 9 3900X are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X4 945 (125W) and Ryzen 9 3900X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | 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 | On certain motherboards (Chipset feature) | - |
Peripherals
Specifications and connection of peripherals supported by Phenom II X4 945 (125W) and Ryzen 9 3900X.
| PCIe version | 2.0 | no data |
Pros & cons summary
| Recency | 23 April 2009 | 7 July 2019 |
| Physical cores | 4 | 12 |
| Threads | 4 | 24 |
| Chip lithography | 45 nm | 7 nm |
| Power consumption (TDP) | 125 Watt | 105 Watt |
Ryzen 9 3900X has an age advantage of 10 years, 200% more physical cores and 500% more threads, a 542.9% more advanced lithography process, and 19% lower power consumption.
We couldn't decide between Phenom II X4 945 (125W) and Ryzen 9 3900X. We've got no test results to judge.
Should you still have questions on choice between Phenom II X4 945 (125W) and Ryzen 9 3900X, ask them in Comments section, and we shall answer.
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