Phenom II X2 B55 vs Phenom II X2 550
Aggregate performance score
Phenom II X2 B55 outperforms Phenom II X2 550 by a minimal 1% based on our aggregate benchmark results.
Primary details
Comparing Phenom II X2 550 and Phenom II X2 B55 processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 2666 | 2655 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 0.02 | 2.02 |
| Market segment | Desktop processor | Desktop processor |
| Power efficiency | 0.87 | 0.88 |
| Architecture codename | Callisto (2009−2010) | Callisto (2009−2010) |
| Release date | 4 November 2009 (15 years ago) | 1 October 2009 (15 years ago) |
| Launch price (MSRP) | $133 | $48 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Phenom II X2 B55 has 10000% better value for money than Phenom II X2 550.
Detailed specifications
Phenom II X2 550 and Phenom II X2 B55 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) | 2 (Dual-core) |
| Threads | 2 | 2 |
| Base clock speed | 3.1 GHz | 3 GHz |
| Boost clock speed | 3.1 GHz | 3 GHz |
| L1 cache | 128 KB (per core) | 128 KB (per core) |
| L2 cache | 512 KB (per core) | 512 KB (per core) |
| L3 cache | 6 MB (shared) | 6 MB (shared) |
| Chip lithography | 45 nm | 45 nm |
| Die size | 258 mm2 | 258 mm2 |
| Number of transistors | 758 million | 758 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Phenom II X2 550 and Phenom II X2 B55 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 | AM3 |
| Power consumption (TDP) | 80 Watt | 80 Watt |
Virtualization technologies
Virtual machine speed-up technologies supported by Phenom II X2 550 and Phenom II X2 B55 are enumerated here.
| AMD-V | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Phenom II X2 550 and Phenom II X2 B55. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR3 | DDR3 |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | On certain motherboards (Chipset feature) | On certain motherboards (Chipset feature) |
Peripherals
Specifications and connection of peripherals supported by Phenom II X2 550 and Phenom II X2 B55.
| PCIe version | 2.0 | 2.0 |
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 | 0.75 | 0.76 |
| Recency | 4 November 2009 | 1 October 2009 |
Phenom II X2 550 has an age advantage of 1 month.
Phenom II X2 B55, on the other hand, has a 1.3% higher aggregate performance score.
Given the minimal performance differences, no clear winner can be declared between Phenom II X2 550 and Phenom II X2 B55.
Should you still have questions on choice between Phenom II X2 550 and Phenom II X2 B55, ask them in Comments section, and we shall answer.
Similar processor comparisons
We picked several similar comparisons of processors in the same market segment and performance relatively close to those reviewed on this page.
