Ryzen 9 9900X vs Opteron 856
Primary details
Comparing Opteron 856 and Ryzen 9 9900X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | not rated | 109 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | no data | 63.40 |
| Market segment | Server | Desktop processor |
| Power efficiency | no data | 27.24 |
| Architecture codename | Athens (2003−2006) | Granite Ridge (2024) |
| Release date | April 2006 (18 years ago) | 15 August 2024 (less than a year ago) |
| Launch price (MSRP) | no data | $499 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Opteron 856 and Ryzen 9 9900X 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 | 1 (Single-Core) | 12 (Dodeca-Core) |
| Threads | 1 | 24 |
| Base clock speed | no data | 4.4 GHz |
| Boost clock speed | 3 GHz | 5.6 GHz |
| L1 cache | 128 KB | 80 KB (per core) |
| L2 cache | 1 MB | 1 MB (per core) |
| L3 cache | 0 KB | 64 MB (shared) |
| Chip lithography | 90 nm | 4 nm |
| Die size | no data | 2x 70.6 mm2 |
| Maximum core temperature | no data | 95 °C |
| Number of transistors | 106 million | 16,630 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on Opteron 856 and Ryzen 9 9900X 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 | 8 | 1 |
| Socket | 940 | AM5 |
| Power consumption (TDP) | 92 Watt | 120 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Opteron 856 and Ryzen 9 9900X. You'll probably need this information if you require some particular technology.
| Instruction set extensions | no data | SMT, AES, AVX, AVX2, AVX512, FMA3, MMX (+), SHA, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A |
| AES-NI | - | + |
| AVX | - | + |
| Precision Boost 2 | no data | + |
Virtualization technologies
Virtual machine speed-up technologies supported by Opteron 856 and Ryzen 9 9900X are enumerated here.
| AMD-V | - | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Opteron 856 and Ryzen 9 9900X. 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 | no data | AMD Radeon Graphics |
Peripherals
Specifications and connection of peripherals supported by Opteron 856 and Ryzen 9 9900X.
| PCIe version | no data | 5.0 |
| PCI Express lanes | no data | 24 |
Pros & cons summary
| Physical cores | 1 | 12 |
| Threads | 1 | 24 |
| Chip lithography | 90 nm | 4 nm |
| Power consumption (TDP) | 92 Watt | 120 Watt |
Opteron 856 has 30.4% lower power consumption.
Ryzen 9 9900X, on the other hand, has 1100% more physical cores and 2300% more threads, and a 2150% more advanced lithography process.
We couldn't decide between Opteron 856 and Ryzen 9 9900X. We've got no test results to judge.
Be aware that Opteron 856 is a server/workstation processor while Ryzen 9 9900X is a desktop one.
Should you still have questions on choice between Opteron 856 and Ryzen 9 9900X, ask them in Comments section, and we shall answer.
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