EPYC 7643P vs Ryzen 9 3900
Aggregate performance score
EPYC 7643P outperforms Ryzen 9 3900 by a whopping 124% based on our aggregate benchmark results.
Primary details
Comparing Ryzen 9 3900 and EPYC 7643P processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 299 | 50 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 20.72 | 13.72 |
| Market segment | Desktop processor | Server |
| Series | AMD Matisse (Ryzen 3000 Desktop) | no data |
| Power efficiency | 28.16 | 18.18 |
| Architecture codename | Matisse (Zen 2) (2019−2020) | Milan (2021−2023) |
| Release date | 24 September 2019 (5 years ago) | 5 September 2023 (1 year ago) |
| Launch price (MSRP) | $499 | $2,722 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Ryzen 9 3900 has 51% better value for money than EPYC 7643P.
Detailed specifications
Ryzen 9 3900 and EPYC 7643P 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) | 48 (Octatetraconta-Core) |
| Threads | 24 | 96 |
| Base clock speed | 3.1 GHz | 2.3 GHz |
| Boost clock speed | 4.3 GHz | 3.6 GHz |
| L1 cache | 64 KB (per core) | 64 KB (per core) |
| L2 cache | 512 KB (per core) | 512 KB (per core) |
| L3 cache | 64 MB | 256 MB (shared) |
| Chip lithography | 7 nm, 12 nm | 7 nm |
| Die size | 2x 74 mm2 | 8x 81 mm2 |
| Number of transistors | 7,600 million | 33,200 million |
| 64 bit support | + | - |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 9 3900 and EPYC 7643P 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 | SP3 |
| Power consumption (TDP) | 65 Watt | 225 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 3900 and EPYC 7643P. You'll probably need this information if you require some particular technology.
| Instruction set extensions | 86x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2 | no data |
| AES-NI | + | + |
| AVX | + | + |
| Precision Boost 2 | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 3900 and EPYC 7643P are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 3900 and EPYC 7643P. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4-3200 | DDR4 |
| 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 | N/A | N/A |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 3900 and EPYC 7643P.
| PCIe version | 4.0 | 4.0 |
| PCI Express lanes | 24 | 128 |
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 | 19.34 | 43.23 |
| Recency | 24 September 2019 | 5 September 2023 |
| Physical cores | 12 | 48 |
| Threads | 24 | 96 |
| Power consumption (TDP) | 65 Watt | 225 Watt |
Ryzen 9 3900 has 246.2% lower power consumption.
EPYC 7643P, on the other hand, has a 123.5% higher aggregate performance score, an age advantage of 3 years, and 300% more physical cores and 300% more threads.
The EPYC 7643P is our recommended choice as it beats the Ryzen 9 3900 in performance tests.
Note that Ryzen 9 3900 is a desktop processor while EPYC 7643P is a server/workstation one.
Should you still have questions on choice between Ryzen 9 3900 and EPYC 7643P, ask them in Comments section, and we shall answer.
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