Athlon II X4 555

Details and Benchmarks for AMD Athlon II X4 555

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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 Athlon II X4 555 based on all benchmark results gathered. Look at this like a meta score, you will find more specific workload ratings below.

4,393 Rank: 1410
Rank Name Score Visual
1406 Xeon L5638 4,396
+0.1%
1407 Pentium G645 4,395
+0%
1408 A8-6600K 4,394
+0%
1409 Core i7-860 4,394
+0%
1410 Athlon II X4 555 4,393
1411 A6-9500E 4,393
+0%
1412 Phenom 9550 4,393
+0%
1413 A8 PRO-7600B 4,391
+-0%
1414 Core i3-5010U 4,390
-0.1%
1415 Xeon Bronze 3106 4,389
-0.1%

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Multicore Score

Multicore performance score for Athlon II X4 555 based on multi-threaded benchmark results.

4,442 Rank: 1341
Rank Name Score Visual
1337 Core i7-2620M 4,443
+0%
1338 Intel Core i7-640M 4,443
+0%
1339 Xeon E5540 4,443
+0%
1340 FX-9830P 4,442
+0%
1341 Athlon II X4 555 4,442
1342 Core i3-3220T 4,442
+0%
1343 Xeon E5-2609 v2 4,442
+0%
1344 Core i3-3210 4,441
+-0%
1345 Core i3-5015U 4,441
+-0%
1346 PRO A10-8770E 4,441
+-0%

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Singlecore Score

Single-core performance score for Athlon II X4 555 based on single-threaded benchmark results.

4,361 Rank: 1428
Rank Name Score Visual
1424 Core i7-640M 4,365
+0.1%
1425 Phenom II X4 B40 4,364
+0.1%
1426 Xeon L5640 4,362
+0%
1427 Core i5-2557M 4,361
+0%
1428 Athlon II X4 555 4,361
1429 PRO A10-8750B 4,361
+0%
1430 Phenom II X4 B55 4,360
+-0%
1431 Xeon X5450 4,358
-0.1%
1432 Xeon E5-2430 v2 4,358
-0.1%
1433 Core i3-560 4,357
-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 Athlon II X4 555 based on integer math, floating point math, and prime number computation benchmarks.

4,540 Rank: 1231
Rank Name Score Visual
1227 Core i5-6200U 4,540
+0%
1228 Core i3-6100H 4,540
+0%
1229 Core i5-5300U 4,540
+0%
1230 Core i7-4510U 4,540
+0%
1231 Athlon II X4 555 4,540
1232 A12-9700P 4,540
+0%
1233 Pentium G3250 4,539
+-0%
1234 Core i7-3687U 4,539
+-0%
1235 A10-7400P 4,539
+-0%
1236 A10-4600M 4,539
+-0%

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Data Processing

Aggregated score for Athlon II X4 555 based on data encryption, data compression, and string sorting benchmarks.

4,543 Rank: 1086
Rank Name Score Visual
1082 Phenom II X4 840 4,544
+0%
1083 Core i3-4340 4,543
+0%
1084 A10-6790K 4,543
+0%
1085 A8-7670K 4,543
+0%
1086 Athlon II X4 555 4,543
1087 Phenom II X4 955 4,543
+0%
1088 Xeon X5460 4,543
+0%
1089 Athlon X4 840 4,543
+0%
1090 Pentium Gold G5420T 4,542
+-0%
1091 Core i5-7267U 4,542
+-0%

View full ranking →

Physics & Compute

Aggregated score for Athlon II X4 555 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

4,516 Rank: 1290
Rank Name Score Visual
1286 Core M-5Y10c 4,517
+0%
1287 Core i3-4030U 4,517
+0%
1288 Pentium Silver J5040 4,517
+0%
1289 Core i7-2637M 4,516
+0%
1290 Athlon II X4 555 4,516
1291 Phenom II X4 955 4,516
+0%
1292 Xeon E5430 4,516
+0%
1293 Core M-5Y51 4,516
+0%
1294 A8-5500B 4,516
+0%
1295 Core i7-2677M 4,515
+-0%

View full ranking →

Athlon II X4 555 Details

The Athlon II X4 555 stands as a notable example of AMD's efforts to deliver value-oriented performance in the mid-2000s, though its relevance today is largely historical. Released during a period when integrated graphics were still a secondary feature and multi-core performance was not yet a standard expectation, the processor reflects a transitional era in desktop computing. As of March 2026, the Athlon II X4 555 is over a decade old, and while it still functions in legacy systems, it is far behind modern CPUs in both raw performance and efficiency. Its design and architecture represent a time when single-threaded performance was often prioritized over multi-threaded scalability, a trend that has since reversed in mainstream computing.

Designed by AMD, the Athlon II X4 555 is based on the K10 microarchitecture, a direct evolution of the earlier Athlon 64 series. Built on a 45 nm process node—though listed as 22 nm in the data, which appears to be an error—it features four cores and four threads, a configuration that was common for mainstream desktops of its time. Despite its quad-core design, the processor operates at a modest base clock of 3.1 GHz with no turbo frequency, a limitation that underscores its position as a budget-friendly option rather than a high-performance solution. The CPU is built for the FCLGA1155 socket and has a thermal design power (TDP) of 55 W, making it suitable for systems with modest cooling solutions.

In terms of memory support, the Athlon II X4 555 can handle up to 32 GB of DDR3-1333/1600 memory across two channels, with a maximum memory bandwidth of 25.6 GB/s. This is sufficient for basic productivity and multimedia tasks but falls well short of modern standards. The integrated graphics, labeled as HD Graphics, are actually a misattribution in the data—this processor does not include an integrated GPU. Instead, it relies on a discrete graphics card for visual output, a common setup for its era. The absence of integrated graphics means users must pair it with a dedicated GPU, which limits its appeal for low-cost or compact systems.

The processor supports a range of advanced features, including SSE4.1, SSE4.2, AVX2, AES-NI, and x86-64, ensuring compatibility with software from its time and even some modern applications. It also includes virtualization technologies such as VT-x and VT-d, as well as security features like TXT and SMEP, which were forward-thinking for its release window. However, the lack of ECC memory support, despite the presence of a "has_ecc_memory_support" field with a value of 1, suggests this may be a mislabeling, as ECC is typically found in server-grade processors.

In benchmark testing, the Athlon II X4 555 achieves an overall score of 4393, ranking #1410 out of 2060 processors in the Passmark database. Its single-core score of 4361 places it at #1427, while its multicore score of 4442 puts it at #1340. These results indicate that while the processor holds up reasonably well in single-threaded workloads, its multi-core performance is somewhat constrained by its age and lack of modern architectural optimizations. It performs similarly to other mid-range CPUs from the early 2010s, such as the Core i3-3210 and Phenom II X4 B97, but is outpaced by nearly every modern processor, even entry-level models.

In conclusion, the Athlon II X4 555 is best suited for legacy systems, retro builds, or light office tasks where power consumption and cost are primary concerns. While it once offered competitive performance, its age and limited capabilities make it obsolete for modern computing needs. For users seeking a capable modern processor, even an entry-level Intel Core i3 or AMD Ryzen 3 would offer vastly superior performance and efficiency.
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AMD Athlon II X4 555

Main Specifications

Designer: AMD
Name: Athlon II X4 555
Model Number: G2120
Cores: 2
Threads: 2
Base Frequency: 3100 MHz
Socket: FCLGA1155
Max CPUs: 1
TDP: 55 W

Cache Specifications

Memory Specifications

Supported Memory Type: DDR3 1333/1600
Memory Channels: 2
Maximum Memory: 0 GB
Maximum Bandwidth: 25.6 GB/s
ECC Support: Yes

PCI-Express Specifications

PCIe Revision: 2.0
PCIe Lanes: 1
PCIe Configuration: up to 1x16, 2x8, 1x8 & 2x4

Integrated Graphics

GPU: HD Graphics
GPU Designer: Intel
GPU Max Frequency: 1050 MHz

Physical Specifications

Process: 22 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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