AMD Athlon II X4 651K vs AMD Athlon II X4 640

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CPU comparison with benchmarks


AMD Athlon II X4 651K CPU1 vs CPU2 AMD Athlon II X4 640
AMD Athlon II X4 651K AMD Athlon II X4 640

CPU comparison

In this CPU comparison, we compare the AMD Athlon II X4 651K and the AMD Athlon II X4 640 and use benchmarks to check which processor is faster.

We compare the AMD Athlon II X4 651K 4 core processor released in Q4/2011 with the AMD Athlon II X4 640 which has 4 CPU cores and was introduced in Q2/2010.
AMD Athlon II (52) Family AMD Athlon II (52)
AMD Athlon II X4 (Llano) (5) CPU group AMD Athlon II X4 (Propus) (10)
2 Generation 1
Llano Architecture Propus
Desktop / Server Segment Desktop / Server
-- Predecessor --
-- Successor AMD Athlon II X4 740

CPU Cores and Base Frequency

The AMD Athlon II X4 651K is a 4 core processor with a clock frequency of 3.00 GHz. The processor can compute 4 threads at the same time. The AMD Athlon II X4 640 clocks with 3.00 GHz, has 4 CPU cores and can calculate 4 threads in parallel.

AMD Athlon II X4 651K Characteristic AMD Athlon II X4 640
4 Cores 4
4 Threads 4
normal Core architecture normal
No Hyperthreading No
Yes Overclocking ? No
3.00 GHz Frequency 3.00 GHz
-- Turbo Frequency (1 Core) --
-- Turbo Frequency (All Cores) --

NPU AI performance

The performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors.

AMD Athlon II X4 651K Characteristic AMD Athlon II X4 640
-- AI hardware --
-- AI specifications --
-- NPU + CPU + iGPU --

Integrated graphics (iGPU)

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.

no iGPU GPU no iGPU
GPU frequency --
-- GPU (Turbo) --
-- GPU Generation --
Technology
Max. displays
-- Compute units --
-- Shader --
No Hardware Raytracing No
No Frame Generation No
-- Max. GPU Memory --
-- 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.

no iGPU GPU no iGPU
No Codec h265 / HEVC (8 bit) No
No Codec h265 / HEVC (10 bit) No
No Codec h264 No
No Codec VP9 No
No Codec VP8 No
No Codec AV1 No
No Codec AVC No
No Codec VC-1 No
No Codec JPEG No

Memory & PCIe

Up to 16 GB of memory in a maximum of 2 memory channels is supported by the AMD Athlon II X4 651K, while the AMD Athlon II X4 640 supports a maximum of 16 GB of memory with a maximum memory bandwidth of 21.3 GB/s enabled.

AMD Athlon II X4 651K Characteristic AMD Athlon II X4 640
DDR3-1333 Memory DDR3-1333
16 GB Max. Memory 16 GB
2 (Dual Channel) Memory channels 2 (Dual Channel)
21.3 GB/s Max. Bandwidth 21.3 GB/s
No ECC No
4.00 MB L2 Cache 2.00 MB
-- L3 Cache --
2.0 PCIe version 2.0
-- PCIe lanes --
-- PCIe Bandwidth --

Thermal Management

The AMD Athlon II X4 651K has a TDP of 100 W. The TDP of the AMD Athlon II X4 640 is 95 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

AMD Athlon II X4 651K Characteristic AMD Athlon II X4 640
100 W TDP (PL1 / PBP) 95 W
-- TDP (PL2) --
-- TDP up --
-- TDP down --
-- Tjunction max. --

Technical details

The AMD Athlon II X4 651K has 4.00 MB cache and is manufactured in 32 nm. The cache of AMD Athlon II X4 640 is at 2.00 MB. The processor is manufactured in 45 nm.

AMD Athlon II X4 651K Characteristic AMD Athlon II X4 640
32 nm Technology 45 nm
Unknown Chip design Unknown
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
MMX, 3DNow!, SSE3, SSE4a ISA extensions MMX, 3DNow!, SSE3, SSE4a
FM1 Socket AM3
AMD-V Virtualization AMD-V
No AES-NI No
Windows 10, Linux Operating systems Windows 10, Linux
Q4/2011 Release date Q2/2010
-- Release price --
show more data show more data


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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks
AMD Athlon II X4 651K (100%)
AMD Athlon II X4 640 (94%)
⌀ Multi core performance in 2 CPU benchmarks
AMD Athlon II X4 651K (100%)
AMD Athlon II X4 640 (92%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
411 (100%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
386 (94%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
1467 (100%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
1332 (91%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
2349 (100%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
2161 (92%)

Cinebench R23 (Single-Core)

Cinebench R23 is the successor of Cinebench R20 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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
389 (100%)

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor of Cinebench R20 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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
1471 (100%)

Cinebench R20 (Single-Core)

Cinebench R20 is the successor of Cinebench R15 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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
152 (100%)

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor of Cinebench R15 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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
582 (100%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.
AMD Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
557 (100%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
71 (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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
AMD Athlon II X4 640 AMD Athlon II X4 640
4C 4T @ 3.00 GHz
274 (100%)

Devices using this processor

AMD Athlon II X4 651K AMD Athlon II X4 640
Unknown Unknown

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