Phenom II X2 B55

Details and Benchmarks for AMD Phenom II X2 B55

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Benchmark Results

Combined benchmark scores based on multiple data points, giving a quick overview of this processor's performance.

Overall Score

Overall score for Phenom II X2 B55 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,211 Rank: 1664
Rank Name Score Visual
1660 Phenom II X3 720 4,211
+0%
1661 A10-4600M 4,211
+0%
1662 Core 2 Duo T5800 4,211
+0%
1663 Phenom II X3 B73 4,211
+0%
1664 Phenom II X2 B55 4,211
1665 Xeon E5345 4,210
+-0%
1666 Xeon D-1518 4,209
+-0%
1667 Xeon E5606 4,208
-0.1%
1668 Pentium 2127U 4,207
-0.1%
1669 Athlon 7750 4,206
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Phenom II X2 B55 based on multi-threaded benchmark results.

4,308 Rank: 1733
Rank Name Score Visual
1729 A6-5400B 4,310
+0%
1730 Pentium 4410Y 4,309
+0%
1731 Celeron G1610T 4,309
+0%
1732 A4-5300B 4,308
+0%
1733 Phenom II X2 B55 4,308
1734 Intel Celeron N3150 4,307
+-0%
1735 Intel Atom x5-Z8500 4,307
+-0%
1736 A8-5600K 4,307
+-0%
1737 Core i7-3517U 4,307
+-0%
1738 Xeon L5420 4,307
+-0%

View full ranking →

Singlecore Score

Single-core performance score for Phenom II X2 B55 based on single-threaded benchmark results.

4,146 Rank: 1633
Rank Name Score Visual
1629 Phenom II X4 920 4,152
+0.1%
1630 Core 2 Duo P8700 4,150
+0.1%
1631 Phenom II X4 830 4,147
+0%
1632 Pentium Gold 4415Y 4,146
+0%
1633 Phenom II X2 B55 4,146
1634 Athlon X2 240 4,145
+-0%
1635 Core i5-450M 4,145
+-0%
1636 Pentium E5300 4,144
+-0%
1637 A4-3420 4,144
+-0%
1638 Core i5-3339Y 4,143
-0.1%

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Workload Scores

Performance scores grouped by workload type, normalized and aggregated from multiple raw benchmark results.

Number Crunching

Aggregated score for Phenom II X2 B55 based on integer math, floating point math, and prime number computation benchmarks.

4,496 Rank: 1569
Rank Name Score Visual
1565 Celeron 1000M 4,496
+0%
1566 Celeron 1037U 4,496
+0%
1567 Pentium N3540 4,496
+0%
1568 Celeron G1820TE 4,496
+0%
1569 Phenom II X2 B55 4,496
1570 Core i5-2537M 4,495
+-0%
1571 A4-4000 4,495
+-0%
1572 Pentium 2117U 4,495
+-0%
1573 A4-5000 4,495
+-0%
1574 Athlon II X2 280 4,495
+-0%

View full ranking →

Data Processing

Aggregated score for Phenom II X2 B55 based on data encryption, data compression, and string sorting benchmarks.

4,468 Rank: 1549
Rank Name Score Visual
1545 Phenom II X2 550 4,468
+0%
1546 Pentium E6500 4,468
+0%
1547 Celeron N2920 4,468
+0%
1548 A6-5400B 4,468
+0%
1549 Phenom II X2 B55 4,468
1550 Core i5-2467M 4,467
+-0%
1551 Pentium G620 4,467
+-0%
1552 Pentium 2020M 4,467
+-0%
1553 Athlon II X2 B24 4,467
+-0%
1554 Core i3-3217U 4,467
+-0%

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Physics & Compute

Aggregated score for Phenom II X2 B55 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,478 Rank: 1559
Rank Name Score Visual
1555 Celeron 1037U 4,478
+0%
1556 A6-5200 4,478
+0%
1557 Pentium 3556U 4,478
+0%
1558 A6-3430MX 4,478
+0%
1559 Phenom II X2 B55 4,478
1560 Celeron 3965Y 4,477
+-0%
1561 A4-7210 4,477
+-0%
1562 Xeon E5320 4,477
+-0%
1563 A6-5400B 4,477
+-0%
1564 Phenom II X2 B53 4,477
+-0%

View full ranking →

Phenom II X2 B55 Details

Ranking #1660 of 2060 in overall performance, the AMD Phenom II X2 B55 sits near the lower end of the competitive landscape as of early 2026, a processor launched in October 2009 as part of AMD's second-generation Phenom lineup. While it was once a mainstream dual-core offering, its age is now evident in both its performance and technological footprint. Built on the 45 nm process and based on the Callisto microarchitecture, the Phenom II X2 B55 features two cores, two threads, and a 3.0 GHz base clock, with a locked multiplier that limits overclocking potential. It operates on the Socket AM3 platform and supports DDR3 memory at up to 1333 MT/s, with dual-channel memory bandwidth delivering a peak of 21.3 GB/s. The chip is fabricated by GlobalFoundries and includes 6 MB of L3 cache, 0.488 MiB of L2 cache, and 0.122 MiB of L1 cache, contributing to its modest data throughput.

Despite its relatively low TDP of 80 W, the Phenom II X2 B55 demands adequate cooling due to its power consumption and lack of modern efficiency improvements. The processor supports ECC memory, a feature valuable in server or workstation environments where data integrity is critical. It also includes AMD-V virtualization technology, enhancing virtual machine performance, and supports a range of instruction sets including SSE, SSE2, SSE3, SSE4a, and 3DNow!, ensuring compatibility with older software and operating systems. While the CPU lacks integrated graphics, certain motherboards with compatible chipsets can provide this functionality, allowing it to serve in basic multimedia applications.

In benchmark testing, the Phenom II X2 B55 achieves an overall score of 4211, with a single-core score of 4146 and a multicore score of 4308. These results place it behind modern processors but ahead of some older low-power and budget chips. In the single-core category, it ranks #1632, outperforming older dual-core designs like the Core 2 Duo P8700 and the Athlon X2 240, but trailing behind higher-end models such as the Phenom II X4 920 and the Core i5-450M. Its multicore performance at #1732 reflects its dual-core architecture, which limits scalability compared to contemporary multi-threaded processors.

The Phenom II X2 B55 is best suited for legacy systems, entry-level desktops, or retro computing environments where backward compatibility is more important than raw performance. While it can handle basic productivity tasks, web browsing, and light multimedia use, it falls short in modern applications that demand high clock speeds or extensive parallel processing. As of February 2026, it remains a historical footnote in AMD’s processor evolution, representing a transitional era between the original Phenom and the more advanced Zen-based designs that followed.
Frequently Compared

AMD Ryzen 7 PRO 2700 24 views

AMD Phenom II X2 555 20 views

AMD Athlon II X3 425 19 views

AMD Ryzen 5 3600 19 views

Intel Xeon W3505 19 views

AMD Ryzen 5 3500X 19 views

Intel Celeron G530 19 views

AMD A10-4600M 19 views

AMD A10-7400P 18 views

AMD Ryzen 7 PRO 2700X 17 views

AMD Phenom II X2 B55

Main Specifications

Designer: AMD
Name: Phenom II X2 B55
Cores: 2
Threads: 2
Base Frequency: 3000 MHz
Clock Multiplier: 15x (locked)
Core Name: Callisto
Socket: Socket AM3
Package: µPGA
Target Segment: Desktop
TDP: 80 W

Cache Specifications

L1 Cache: 124.928 KiB
L2 Cache: 0.488 MiB
L3 Cache: 5.722 MiB

Memory Specifications

Supported Memory Type: DDR3

Physical Specifications

Process: 45 nm
Die Area: 258 mm²
Transistor Count: 0.00 billion
Manufacturer: GlobalFoundries

CPU Features

MMX SSE SSE2 SSE3 ABM SSE4a AMD-V 3DNow!
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