EPYC 9645 vs Ryzen 9 9900X
Primary details
Comparing Ryzen 9 9900X and EPYC 9645 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 109 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 63.40 | no data |
| Market segment | Desktop processor | Server |
| Power efficiency | 27.24 | no data |
| Architecture codename | Granite Ridge (2024) | Turin (2024) |
| Release date | 15 August 2024 (less than a year ago) | 10 October 2024 (less than a year ago) |
| Launch price (MSRP) | $499 | $11,048 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Ryzen 9 9900X 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 | 12 (Dodeca-Core) | 96 |
| Threads | 24 | 192 |
| Base clock speed | 4.4 GHz | 2.3 GHz |
| Boost clock speed | 5.6 GHz | 3.7 GHz |
| L1 cache | 80 KB (per core) | 80 KB (per core) |
| L2 cache | 1 MB (per core) | 1 MB (per core) |
| L3 cache | 64 MB (shared) | 256 MB (shared) |
| Chip lithography | 4 nm | 3 nm |
| Die size | 2x 70.6 mm2 | no data |
| Maximum core temperature | 95 °C | no data |
| Number of transistors | 16,630 million | no data |
| 64 bit support | + | + |
| Unlocked multiplier | + | - |
Compatibility
Information on Ryzen 9 9900X 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 | 1 | 2 |
| Socket | AM5 | SP5 |
| Power consumption (TDP) | 120 Watt | 320 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Ryzen 9 9900X and EPYC 9645. You'll probably need this information if you require some particular technology.
| Instruction set extensions | SMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A | no data |
| AES-NI | + | + |
| AVX | + | + |
| Precision Boost 2 | + | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Ryzen 9 9900X and EPYC 9645 are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Ryzen 9 9900X and EPYC 9645. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR5 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | AMD Radeon Graphics | N/A |
Peripherals
Specifications and connection of peripherals supported by Ryzen 9 9900X and EPYC 9645.
| PCIe version | 5.0 | 5.0 |
| PCI Express lanes | 24 | 128 |
Pros & cons summary
| Recency | 15 August 2024 | 10 October 2024 |
| Physical cores | 12 | 96 |
| Threads | 24 | 192 |
| Chip lithography | 4 nm | 3 nm |
| Power consumption (TDP) | 120 Watt | 320 Watt |
Ryzen 9 9900X has 166.7% lower power consumption.
EPYC 9645, on the other hand, has an age advantage of 1 month, 700% more physical cores and 700% more threads, and a 33.3% more advanced lithography process.
We couldn't decide between Ryzen 9 9900X and EPYC 9645. We've got no test results to judge.
Note that Ryzen 9 9900X is a desktop processor while EPYC 9645 is a server/workstation one.
Should you still have questions on choice between Ryzen 9 9900X and EPYC 9645, ask them in Comments section, and we shall answer.
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