Ryzen 5 PRO 8645HS vs Ryzen 9 3900XT
Primary details
Comparing Ryzen 9 3900XT and Ryzen 5 PRO 8645HS processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 268 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 25.01 | no data |
| Market segment | Desktop processor | Server |
| Series | AMD Ryzen 9 | no data |
| Power efficiency | 18.53 | no data |
| Architecture codename | Matisse 2 (2020) | Hawk Point (2024) |
| Release date | 7 July 2020 (4 years ago) | 16 April 2024 (less than a year ago) |
| Launch price (MSRP) | $499 | no data |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Ryzen 9 3900XT 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 | 3.8 GHz | 4.3 GHz |
| Boost clock speed | 4.7 GHz | 5 GHz |
| L1 cache | 96K (per core) | 64 KB (per core) |
| L2 cache | 512K (per core) | 1 MB (per core) |
| L3 cache | 64 MB | 16 MB (shared) |
| Chip lithography | 7 nm, 12 nm | 4 nm |
| Die size | 74 mm2 | 178 mm2 |
| Maximum case temperature (TCase) | 95 °C | no data |
| Number of transistors | 3,800 million | 25,000 million |
| 64 bit support | + | + |
| Windows 11 compatibility | + | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 9 3900XT 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 | 1 |
| Socket | AM4 | FP7 |
| Power consumption (TDP) | 105 Watt | 45 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 3900XT 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 3900XT and Ryzen 5 PRO 8645HS are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3900XT 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 |
| ECC memory support | + | - |
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 3900XT and Ryzen 5 PRO 8645HS.
| PCIe version | 4.0 | 4.0 |
| PCI Express lanes | no data | 20 |
Pros & cons summary
| Recency | 7 July 2020 | 16 April 2024 |
| Physical cores | 12 | 6 |
| Threads | 24 | 12 |
| Chip lithography | 7 nm | 4 nm |
| Power consumption (TDP) | 105 Watt | 45 Watt |
Ryzen 9 3900XT has 100% more physical cores and 100% more threads.
Ryzen 5 PRO 8645HS, on the other hand, has an age advantage of 3 years, a 75% more advanced lithography process, and 133.3% lower power consumption.
We couldn't decide between Ryzen 9 3900XT and Ryzen 5 PRO 8645HS. We've got no test results to judge.
Note that Ryzen 9 3900XT is a desktop processor while Ryzen 5 PRO 8645HS is a server/workstation one.
Should you still have questions on choice between Ryzen 9 3900XT and Ryzen 5 PRO 8645HS, ask them in Comments section, and we shall answer.
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