Athlon II X4 651

Details and Benchmarks for AMD Athlon II X4 651

Sysbuilds Alpha Stage!

Please take all results with a big grain of salt. Sysbuilds is in alpha stage at the moment which can lead to wrong data, strange counting errors, silly results and more. This site is under active development.

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

4,573 Rank: 1215
Rank Name Score Visual
1211 Core M 5Y10 4,578
+0.1%
1212 Core i3-2130 4,578
+0.1%
1213 Core i5-2500 4,576
+0.1%
1214 Phenom II X6 1100T 4,576
+0.1%
1215 Athlon II X4 651 4,573
1216 Xeon E3-1235 4,572
+-0%
1217 Xeon W3580 4,571
+-0%
1218 Core i5-3320M 4,570
-0.1%
1219 Ryzen 3 3250U 4,568
-0.1%
1220 Core i5 M 450 4,567
-0.1%

View full ranking →

Multicore Score

Multicore performance score for Athlon II X4 651 based on multi-threaded benchmark results.

4,490 Rank: 1245
Rank Name Score Visual
1241 Core i7-960 4,494
+0.1%
1242 Core i7-3520M 4,493
+0.1%
1243 Ryzen 3 2200U 4,491
+0%
1244 Core i7-875K 4,491
+0%
1245 Athlon II X4 651 4,490
1246 Phenom II X6 1090T 4,489
+-0%
1247 Core M 5Y10 4,488
+-0%
1248 Pentium G3258 4,488
+-0%
1249 Xeon E5440 4,488
+-0%
1250 Phenom 9950 4,488
+-0%

View full ranking →

Singlecore Score

Single-core performance score for Athlon II X4 651 based on single-threaded benchmark results.

4,629 Rank: 1196
Rank Name Score Visual
1192 Core i3-6100U 4,630
+0%
1193 Core i7 930 4,630
+0%
1194 Celeron G1840 4,630
+0%
1195 Core i5-4210U 4,630
+0%
1196 Athlon II X4 651 4,629
1197 Pentium 4417U 4,627
+-0%
1198 Pentium G3450T 4,627
+-0%
1199 Core i7-3667U 4,626
-0.1%
1200 Celeron G1830 4,621
-0.2%
1201 Xeon W3670 4,621
-0.2%

View full ranking →

Workload Scores

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

Number Crunching

Aggregated score for Athlon II X4 651 based on integer math, floating point math, and prime number computation benchmarks.

-- Rank: --

Number Crunching score not yet available.

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Data Processing

Aggregated score for Athlon II X4 651 based on data encryption, data compression, and string sorting benchmarks.

-- Rank: --

Data Processing score not yet available.

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Physics & Compute

Aggregated score for Athlon II X4 651 based on physics simulation and extended instruction set (SSE/AVX) benchmarks.

-- Rank: --

Physics & Compute score not yet available.

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Athlon II X4 651 Details

For budget-conscious desktop users seeking a capable processor for general productivity and light multimedia tasks, the AMD Athlon II X4 651 remains a relevant option despite its age. Launched in November 2011, this four-core CPU is now over a decade old, placing it firmly in the legacy category. While it lacks modern features and performance parity with today’s processors, it still holds a modest position in the broader performance landscape. Built on AMD’s Llano architecture and fabricated on a 32 nm process, the Athlon II X4 651 features a base clock of 3.0 GHz and a locked multiplier, limiting overclocking potential.

It operates on the FM1 socket and is designed for desktop systems, requiring a compatible motherboard such as those based on the A75 or A55 chipsets. The processor includes 1 MB of L2 cache per core, totaling 4 MB, and supports dual-channel DDR3 memory up to 16 GB, with a maximum bandwidth of 25.6 GB/s. With a TDP of 100 W, it demands adequate cooling, especially under sustained load. The Athlon II X4 651 does not feature integrated graphics, so a discrete GPU is required for display output.

Despite these limitations, the processor supports a wide range of technologies, including SSE, AVX2, AES-NI, and AMD-V, enabling efficient virtualization and encryption operations. In benchmark testing, the Athlon II X4 651 achieves an Overall Score of 4573, ranking #1215 out of 2060 processors, with a Singlecore Score of 4629 (#1196) and a Multicore Score of 4490 (#1245). These results place it behind modern mobile and desktop CPUs but ahead of many older low-power and entry-level processors. Its performance is comparable to early 2010s Intel Core i3 and i5 models, though it trails significantly behind current-generation offerings.

Given its age and power consumption, the Athlon II X4 651 is best suited for secondary systems, retro builds, or budget systems where cost and compatibility take precedence over raw performance. As of March 2026, it remains a niche option for users with legacy hardware or specific use cases requiring a reliable, low-cost processor.
Frequently Compared

Intel Core M 5Y10c 11 views

Intel Core i5-3320M 6 views

AMD Ryzen 3 PRO 2200GE 1 view

AMD Ryzen 9 PRO 3900 1 view

AMD Ryzen 5 PRO 3500U 1 view

Intel Xeon Silver 4208 1 view

Intel Xeon Silver 4116 1 view

Intel Xeon Silver 4112 1 view

Intel Core i7-7500U 1 view

Intel Core i7-6820HQ 1 view

AMD Athlon II X4 651

Main Specifications

Designer: AMD
Name: Athlon II X4 651
Model Number: i5-5250U
Cores: 2
Threads: 4
Base Frequency: 1600 MHz
Clock Multiplier: 30x (locked)
Core Name: Llano
Socket: FCBGA1168
Package: µPGA
Target Segment: Desktop
Max CPUs: 1
TDP: 15 W

Cache Specifications

L1 Cache: 124.928 KiB
L2 Cache: 0.954 MiB

Memory Specifications

Supported Memory Type: DDR3L 1333/1600, LPDDR3 1600/1866
Memory Channels: 2
Maximum Memory: 0 GB
Maximum Bandwidth: 25.6 GB/s
ECC Support: No

PCI-Express Specifications

PCIe Revision: 2.0
PCIe Lanes: 12
PCIe Configuration: 4x1, 2x4

Integrated Graphics

GPU: HD Graphics 6000
GPU Designer: Intel
GPU Max Frequency: 950 MHz

Physical Specifications

Process: 14 nm
Die Area: 228 mm²
Manufacturer: GlobalFoundries
Word Size: 64-bit

CPU Features

MMX SSE SSE2 SSE3 SSE4.1 SSE4.2 AVX2 AES x86-64 HT EIST TXT vPro VT-x VT-d EPT Secure Key SMEP SIPP IPT SSE4a AMD-V TSX Flex Memory FMA 3DNow!
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