Ryzen 9 9950X vs Phenom II X2 B55
Aggregate performance score
Ryzen 9 9950X outperforms Phenom II X2 B55 by a whopping 5503% based on our aggregate benchmark results.
Primary details
Comparing Phenom II X2 B55 and Ryzen 9 9950X processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2655 | 59 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 2.02 | 61.38 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.88 | 23.26 |
| Architecture codename | Callisto (2009−2010) | Granite Ridge (2024) |
| Release date | 1 October 2009 (15 years ago) | 15 August 2024 (less than a year ago) |
| Launch price (MSRP) | $48 | $649 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Ryzen 9 9950X has 2939% better value for money than Phenom II X2 B55.
Detailed specifications
Phenom II X2 B55 and Ryzen 9 9950X 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 | 2 (Dual-core) | 16 (Hexadeca-Core) |
| Threads | 2 | 32 |
| Base clock speed | 3 GHz | 4.3 GHz |
| Boost clock speed | 3 GHz | 5.7 GHz |
| L1 cache | 128 KB (per core) | 80 KB (per core) |
| L2 cache | 512 KB (per core) | 1 MB (per core) |
| L3 cache | 6 MB (shared) | 64 MB (shared) |
| Chip lithography | 45 nm | 4 nm |
| Die size | 258 mm2 | 2x 70.6 mm2 |
| Maximum core temperature | no data | 95 °C |
| Number of transistors | 758 million | 16,630 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | no data |
| Unlocked multiplier | - | + |
Compatibility
Information on Phenom II X2 B55 and Ryzen 9 9950X 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 | AM3 | AM5 |
| Power consumption (TDP) | 80 Watt | 170 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Phenom II X2 B55 and Ryzen 9 9950X. 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 Phenom II X2 B55 and Ryzen 9 9950X are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X2 B55 and Ryzen 9 9950X. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR5 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | AMD Radeon Graphics |
Peripherals
Specifications and connection of peripherals supported by Phenom II X2 B55 and Ryzen 9 9950X.
| PCIe version | 2.0 | 5.0 |
| PCI Express lanes | no data | 24 |
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 | 0.76 | 42.58 |
| Recency | 1 October 2009 | 15 August 2024 |
| Physical cores | 2 | 16 |
| Threads | 2 | 32 |
| Chip lithography | 45 nm | 4 nm |
| Power consumption (TDP) | 80 Watt | 170 Watt |
Phenom II X2 B55 has 112.5% lower power consumption.
Ryzen 9 9950X, on the other hand, has a 5502.6% higher aggregate performance score, an age advantage of 14 years, 700% more physical cores and 1500% more threads, and a 1025% more advanced lithography process.
The Ryzen 9 9950X is our recommended choice as it beats the Phenom II X2 B55 in performance tests.
Should you still have questions on choice between Phenom II X2 B55 and Ryzen 9 9950X, ask them in Comments section, and we shall answer.
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