Phenom II X4 B55

Details and Benchmarks for AMD Phenom II X4 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 X4 B55 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,428 Rank: 1362
Rank Name Score Visual
1358 Xeon E5-2650L v2 4,431
+0.1%
1359 Core i5-2390T 4,431
+0.1%
1360 Athlon X4 840 4,431
+0.1%
1361 Pentium 4415U 4,430
+0%
1362 Phenom II X4 B55 4,428
1363 Core i3-2120T 4,427
+-0%
1364 A10 PRO-7800B 4,426
+-0%
1365 FX-8800P 4,424
-0.1%
1366 Core i5-2515E 4,423
-0.1%
1367 A10-7700K 4,423
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Phenom II X4 B55 based on multi-threaded benchmark results.

4,530 Rank: 1178
Rank Name Score Visual
1174 Xeon E5507 4,533
+0.1%
1175 Phenom II X4 940 4,532
+0%
1176 Xeon D-1518 4,531
+0%
1177 Core i3-2357M 4,530
+0%
1178 Phenom II X4 B55 4,530
1179 Core i5-6260U 4,529
+-0%
1180 Intel Core i3-7100U 4,528
+-0%
1181 A8-7650K 4,527
-0.1%
1182 Core i7-5650U 4,526
-0.1%
1183 Core i5-5257U 4,526
-0.1%

View full ranking →

Singlecore Score

Single-core performance score for Phenom II X4 B55 based on single-threaded benchmark results.

4,360 Rank: 1430
Rank Name Score Visual
1426 Xeon L5640 4,362
+0%
1427 Core i5-2557M 4,361
+0%
1428 Athlon II X4 555 4,361
+0%
1429 PRO A10-8750B 4,361
+0%
1430 Phenom II X4 B55 4,360
1431 Xeon X5450 4,358
+-0%
1432 Xeon E5-2430 v2 4,358
+-0%
1433 Core i3-560 4,357
-0.1%
1434 Core i7-940 4,356
-0.1%
1435 Athlon II X2 270 4,355
-0.1%

View full ranking →

Workload Scores

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

Number Crunching

Aggregated score for Phenom II X4 B55 based on integer math, floating point math, and prime number computation benchmarks.

4,544 Rank: 1203
Rank Name Score Visual
1199 Phenom II X4 B60 4,545
+0%
1200 Pentium G4400 4,544
+0%
1201 Core i5-6360U 4,544
+0%
1202 Phenom II X4 975 4,544
+0%
1203 Phenom II X4 B55 4,544
1204 Pentium G3450T 4,544
+0%
1205 Core i3-4150T 4,544
+0%
1206 Pentium G3258 4,543
+-0%
1207 Pentium G3260 4,543
+-0%
1208 Core i7-4600U 4,543
+-0%

View full ranking →

Data Processing

Aggregated score for Phenom II X4 B55 based on data encryption, data compression, and string sorting benchmarks.

4,547 Rank: 1066
Rank Name Score Visual
1062 Core i5-2405S 4,548
+0%
1063 Phenom II X4 B60 4,548
+0%
1064 Core i7-6567U 4,547
+0%
1065 Core i3-4170 4,547
+0%
1066 Phenom II X4 B55 4,547
1067 Athlon X4 860K 4,547
+0%
1068 Core i5-7260U 4,546
+-0%
1069 Core i3-4350 4,546
+-0%
1070 Phenom II X4 975 4,546
+-0%
1071 A10-7850K 4,546
+-0%

View full ranking →

Physics & Compute

Aggregated score for Phenom II X4 B55 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,515 Rank: 1298
Rank Name Score Visual
1294 A8-5500B 4,516
+0%
1295 Core i7-2677M 4,515
+0%
1296 Pentium G3260 4,515
+0%
1297 Pentium G3420 4,515
+0%
1298 Phenom II X4 B55 4,515
1299 Phenom II X4 B50 4,515
+0%
1300 Xeon E5506 4,515
+0%
1301 Core M-5Y71 4,515
+0%
1302 Core M-5Y31 4,515
+0%
1303 Core i5-680 4,515
+0%

View full ranking →

Phenom II X4 B55 Details

Ranking #1362 of 2060 in overall performance, the Phenom II X4 B55 sits in the middle tier of processors when compared to the broader CPU landscape as of March 2026. While it may not compete with modern high-end CPUs, its position reflects a design optimized for cost-effective performance in mainstream desktop systems from the early 2010s. The processor was released during a time when multi-core computing was gaining traction, though still in its early stages for consumer-grade applications.

Manufactured by AMD, the Phenom II X4 B55 is built on the 32 nm process node and uses the FCLGA1156 socket, a common interface for its era. It features a dual-core design with four threads, enabled through AMD's SMT (Simultaneous Multithreading) technology, allowing it to handle multitasking more efficiently than its single-threaded predecessors. The base clock speed is 3.2 GHz, with a turbo frequency of 3.46 GHz, making it capable of sustained performance under moderate workloads.

The processor supports DDR3 1066/1333 memory, with a maximum capacity of 16 GB and a memory bandwidth of 21 GB/s across two channels. Its integrated graphics, based on the Intel HD Graphics architecture, operates at a base frequency of 733 MHz and can support up to two displays. The GPU includes a burst frequency of 1100 MHz and supports up to 1.7 GB of shared memory, offering basic multimedia and light gaming capabilities.

Despite being a relatively older design, the Phenom II X4 B55 includes several advanced features such as SSE4.1, SSE4.2, AVX2, AES encryption, and Intel’s vPro, TXT, and VT-x virtualization technologies. It also supports ECC memory, making it suitable for workstations requiring data integrity. The TDP of 73 W reflects a balance between performance and power consumption, though it is higher than modern low-power processors.

In benchmark testing, the Phenom II X4 B55 achieves a single-core score of 4360, placing it at #1430 of 2060, and a multicore score of 4530, ranking #1177 of 2060. Its overall score of 4428 puts it ahead of some modern low-power processors like the Core i3-6260U and A8-7650K, but behind higher-tier CPUs such as the Core i5-2400S and Xeon E5507. This suggests that while it holds its own in single-threaded tasks, its multicore performance is more competitive.

The processor's strongest category is its single-core performance, where it outperforms many modern low-power mobile chips. However, its multicore strength is more modest, especially when compared to current-generation CPUs. This makes it suitable for general productivity, light content creation, and older gaming applications, but less ideal for heavy computational workloads or modern multi-threaded software.

Overall, the Phenom II X4 B55 remains a viable option for budget-conscious users or those maintaining legacy systems. While it lacks the efficiency and performance of modern processors, its feature set and compatibility with DDR3 memory make it a practical choice for entry-level desktop use in 2026.
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AMD Phenom II X4 B55

Main Specifications

Designer: AMD
Name: Phenom II X4 B55
Model Number: i3-550
Cores: 2
Threads: 4
Base Frequency: 3200 MHz
Socket: FCLGA1156
Max CPUs: 1
TDP: 73 W

Cache Specifications

Memory Specifications

Supported Memory Type: DDR3 1066/1333
Memory Channels: 2
Maximum Memory: 0 GB
Maximum Bandwidth: 21 GB/s
ECC Support: Yes

PCI-Express Specifications

PCIe Revision: 2.0
PCIe Lanes: 16
PCIe Configuration: 1x16, 2x8

Integrated Graphics

GPU: HD Graphics
GPU Designer: Intel
GPU Max Frequency: 1100 MHz

Physical Specifications

Process: 32 nm
Word Size: 64-bit

CPU Features

SSE4.1 SSE4.2 AVX2 AES x86-64 HT EIST TXT vPro VT-x VT-d EPT Secure Key SMEP SIPP IPT TSX Flex Memory FMA
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