EPYC 9645 vs Ryzen 9 5900H
Primary details
Comparing Ryzen 9 5900H and EPYC 9645 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 578 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Market segment | Laptop | Server |
| Series | AMD Cezanne (Zen 3, Ryzen 5000) | no data |
| Power efficiency | 27.21 | no data |
| Architecture codename | Cezanne U (Zen 3) (2021−2022) | Turin (2024) |
| Release date | 7 January 2021 (3 years ago) | 10 October 2024 (recently) |
| Launch price (MSRP) | no data | $11,048 |
Detailed specifications
Ryzen 9 5900H and EPYC 9645 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 | 8 (Octa-Core) | 96 |
| Threads | 16 | 192 |
| Base clock speed | 3.3 GHz | 2.3 GHz |
| Boost clock speed | 4.6 GHz | 3.7 GHz |
| L1 cache | 512 KB | 80 KB (per core) |
| L2 cache | 4 MB | 1 MB (per core) |
| L3 cache | 16 MB | 256 MB (shared) |
| Chip lithography | 7 nm | 3 nm |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
Compatibility
Information on Ryzen 9 5900H and EPYC 9645 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 | no data | 2 |
| Socket | FP6 | SP5 |
| Power consumption (TDP) | 45 Watt | 320 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 5900H and EPYC 9645. You'll probably need this information if you require some particular technology.
| Instruction set extensions | XFR, FMA3, SSE 4.2, AVX2, SMT | no data |
| AES-NI | - | + |
| AVX | - | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 5900H and EPYC 9645 are enumerated here.
| AMD-V | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 5900H and EPYC 9645. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | no data | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | AMD Radeon RX Vega 8 (Ryzen 4000/5000) | N/A |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 5900H and EPYC 9645.
| PCIe version | no data | 5.0 |
| PCI Express lanes | no data | 128 |
Pros & cons summary
| Recency | 7 January 2021 | 10 October 2024 |
| Physical cores | 8 | 96 |
| Threads | 16 | 192 |
| Chip lithography | 7 nm | 3 nm |
| Power consumption (TDP) | 45 Watt | 320 Watt |
Ryzen 9 5900H has 611.1% lower power consumption.
EPYC 9645, on the other hand, has an age advantage of 3 years, 1100% more physical cores and 1100% more threads, and a 133.3% more advanced lithography process.
We couldn't decide between Ryzen 9 5900H and EPYC 9645. We've got no test results to judge.
Be aware that Ryzen 9 5900H is a notebook processor while EPYC 9645 is a server/workstation one.
Should you still have questions on choice between Ryzen 9 5900H and EPYC 9645, ask them in Comments section, and we shall answer.
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