Ryzen 5 PRO 8645HS vs Ryzen 9 PRO 3900
Primary details
Comparing Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 280 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Desktop processor | Server |
| Series | AMD Ryzen 9 | no data |
| Power efficiency | 28.97 | no data |
| Architecture codename | Zen 2 (2017−2020) | Hawk Point (2024) |
| Release date | 30 September 2019 (5 years ago) | 16 April 2024 (less than a year ago) |
Detailed specifications
Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS 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 | 12 (Dodeca-Core) | 6 (Hexa-Core) |
| Threads | 24 | 12 |
| Base clock speed | 3.1 GHz | 4.3 GHz |
| Boost clock speed | 4.3 GHz | 5 GHz |
| L1 cache | 768 KB | 64 KB (per core) |
| L2 cache | 6 MB | 1 MB (per core) |
| L3 cache | 64 MB | 16 MB (shared) |
| Chip lithography | 7 nm, 12 nm | 4 nm |
| Die size | no data | 178 mm2 |
| Number of transistors | no data | 25,000 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
Compatibility
Information on Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS 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 (Uniprocessor) | 1 |
| Socket | Socket AM4 | FP7 |
| Power consumption (TDP) | 65 Watt | 45 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS. You'll probably need this information if you require some particular technology.
| AES-NI | + | + |
| AVX | + | + |
| Precision Boost 2 | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-3200 | DDR5 |
| Maximum memory size | 128 GB | no data |
| Max memory channels | 2 | no data |
| Maximum memory bandwidth | 51.196 GB/s | no data |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | - | AMD Radeon 760M |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS.
| PCIe version | no data | 4.0 |
| PCI Express lanes | no data | 20 |
Pros & cons summary
| Recency | 30 September 2019 | 16 April 2024 |
| Physical cores | 12 | 6 |
| Threads | 24 | 12 |
| Chip lithography | 7 nm | 4 nm |
| Power consumption (TDP) | 65 Watt | 45 Watt |
Ryzen 9 PRO 3900 has 100% more physical cores and 100% more threads.
Ryzen 5 PRO 8645HS, on the other hand, has an age advantage of 4 years, a 75% more advanced lithography process, and 44.4% lower power consumption.
We couldn't decide between Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS. We've got no test results to judge.
Note that Ryzen 9 PRO 3900 is a desktop processor while Ryzen 5 PRO 8645HS is a server/workstation one.
Should you still have questions on choice between Ryzen 9 PRO 3900 and Ryzen 5 PRO 8645HS, ask them in Comments section, and we shall answer.
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