AMD Ryzen 3 5400U vs AMD Phenom II X2 521

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CPU comparison with benchmarks


AMD Ryzen 3 5400U CPU1 vs CPU2 AMD Phenom II X2 521
AMD Ryzen 3 5400U AMD Phenom II X2 521

CPU comparison

In this CPU comparison, we compare the AMD Ryzen 3 5400U and the AMD Phenom II X2 521 and use benchmarks to check which processor is faster.

We compare the AMD Ryzen 3 5400U 4 core processor released in Q1/2021 with the AMD Phenom II X2 521 which has 2 CPU cores and was introduced in Q2/2011.
AMD Ryzen 3 (33) Family AMD Phenom II (52)
AMD Ryzen 5000U (13) CPU group AMD Phenom II - 500 (2)
4 Generation 1
Cezanne (Zen 3) Architecture Regor (K10)
Mobile Segment Desktop / Server
-- Predecessor --
-- Successor --

CPU Cores and Base Frequency

The AMD Ryzen 3 5400U is a 4 core processor with a clock frequency of 2.60 GHz (4.00 GHz). The processor can compute 8 threads at the same time. The AMD Phenom II X2 521 clocks with 3.50 GHz, has 2 CPU cores and can calculate 2 threads in parallel.

AMD Ryzen 3 5400U Characteristic AMD Phenom II X2 521
4 Cores 2
8 Threads 2
normal Core architecture normal
Yes Hyperthreading No
No Overclocking ? Yes
2.60 GHz Frequency 3.50 GHz
4.00 GHz Turbo Frequency (1 Core) --
3.80 GHz Turbo Frequency (All Cores) --

Artificial Intelligence and Machine Learning

Processors with the support of artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors. Algorithms for ML improve their performance the more data they have collected via software. ML tasks can be processed up to 10,000 times faster than with a classic processor.

AMD Ryzen 3 5400U Characteristic AMD Phenom II X2 521
-- AI hardware --
-- AI specifications --

Internal Graphics

Graphics (iGPU) integrated into the processor not only enable image output without having to rely on a dedicated graphics solution, but can also efficiently accelerate video playback.

AMD Radeon RX Vega 6 (Renoir) GPU no iGPU
0.40 GHz GPU frequency --
1.60 GHz GPU (Turbo) --
9 GPU Generation --
7 nm Technology
3 Max. displays
6 Compute units --
384 Shader --
No Hardware Raytracing No
No Frame Generation No
2 GB Max. GPU Memory --
12 DirectX Version --

Hardware codec support

A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.

AMD Radeon RX Vega 6 (Renoir) GPU no iGPU
Decode / Encode Codec h265 / HEVC (8 bit) No
Decode / Encode Codec h265 / HEVC (10 bit) No
Decode / Encode Codec h264 No
Decode / Encode Codec VP9 No
Decode / Encode Codec VP8 No
No Codec AV1 No
Decode / Encode Codec AVC No
Decode Codec VC-1 No
Decode / Encode Codec JPEG No

Memory & PCIe

Up to 32 GB of memory in a maximum of 2 memory channels is supported by the AMD Ryzen 3 5400U, while the AMD Phenom II X2 521 supports a maximum of GB of memory with a maximum memory bandwidth of 21.3 GB/s enabled.

AMD Ryzen 3 5400U Characteristic AMD Phenom II X2 521
LPDDR4-4266, DDR4-3200 Memory DDR3-1333, DDR2-1066
32 GB Max. Memory
2 (Dual Channel) Memory channels 2 (Dual Channel)
51.2 GB/s Max. Bandwidth 21.3 GB/s
Yes ECC No
2.00 MB L2 Cache --
8.00 MB L3 Cache 2.00 MB
3.0 PCIe version --
12 PCIe lanes --
11.8 GB/s PCIe Bandwidth --

Thermal Management

The AMD Ryzen 3 5400U has a TDP of 15 W. The TDP of the AMD Phenom II X2 521 is 65 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

AMD Ryzen 3 5400U Characteristic AMD Phenom II X2 521
15 W TDP (PL1 / PBP) 65 W
-- TDP (PL2) --
25 W TDP up --
10 W TDP down --
105 °C Tjunction max. --

Technical details

The AMD Ryzen 3 5400U has 10.00 MB cache and is manufactured in 7 nm. The cache of AMD Phenom II X2 521 is at 2.00 MB. The processor is manufactured in 45 nm.

AMD Ryzen 3 5400U Characteristic AMD Phenom II X2 521
7 nm Technology 45 nm
Chiplet Chip design Unknown
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
SSE4a, SSE4.1, SSE4.2, AVX2, FMA3 ISA extensions SSE3, SSE4a
FP6 Socket AM3
AMD-V, SVM Virtualization AMD-V
Yes AES-NI No
Windows 10, Windows 11, Linux Operating systems Windows 10, Linux
Q1/2021 Release date Q2/2011
-- Release price 35 $
show more data show more data


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Average performance in benchmarks

⌀ Single core performance in 0 CPU benchmarks
AMD Ryzen 3 5400U (0%)
AMD Phenom II X2 521 (0%)
⌀ Multi core performance in 1 CPU benchmarks
AMD Ryzen 3 5400U (100%)
AMD Phenom II X2 521 (20%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 3.80 GHz
11214 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
2253 (20%)

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 4.00 GHz
1180 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
0 (0%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 3.80 GHz
3682 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
0 (0%)

Geekbench 6 (Single-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The single-core benchmark only evaluates the performance of the fastest CPU core, the number of CPU cores in a processor is irrelevant here.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 4.00 GHz
1630 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
0 (0%)

Geekbench 6 (Multi-Core)

Geekbench 6 is a benchmark for modern computers, notebooks and smartphones. What is new is an optimized utilization of newer CPU architectures, e.g. based on the big.LITTLE concept and combining CPU cores of different sizes. The multi-core benchmark evaluates the performance of all of the processor's CPU cores. Virtual thread improvements such as AMD SMT or Intel's Hyper-Threading have a positive impact on the benchmark result.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 3.80 GHz
3600 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
0 (0%)

iGPU - FP32 Performance (Single-precision GFLOPS)

The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
AMD Radeon RX Vega 6 (Renoir) @ 1.60 GHz
1229 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
@ 0.00 GHz
0 (0%)

Blender 3.1 Benchmark

In the Blender Benchmark 3.1, the scenes "monster", "junkshop" and "classroom" are rendered and the time required by the system is measured. In our benchmark we test the CPU and not the graphics card. Blender 3.1 was presented as a standalone version in March 2022.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 3.80 GHz
73 (100%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
0 (0%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 4.00 GHz
0 (0%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
92 (100%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.
AMD Ryzen 3 5400U AMD Ryzen 3 5400U
4C 8T @ 3.80 GHz
0 (0%)
AMD Phenom II X2 521 AMD Phenom II X2 521
2C 2T @ 3.50 GHz
177 (100%)

Devices using this processor

AMD Ryzen 3 5400U AMD Phenom II X2 521
Unknown Unknown

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