AMD Athlon II X4 651K vs Apple A8X

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CPU comparison with benchmarks


AMD Athlon II X4 651K CPU1 vs CPU2 Apple A8X
AMD Athlon II X4 651K Apple A8X

CPU comparison

In this CPU comparison, we compare the AMD Athlon II X4 651K and the Apple A8X 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 Apple A8X which has 3 CPU cores and was introduced in Q3/2014.
AMD Athlon II (52) Family Apple A series (22)
AMD Athlon II X4 (Llano) (5) CPU group Apple A8/A8X (2)
2 Generation 8
Llano Architecture A8
Desktop / Server Segment Mobile
-- Predecessor Apple A6X
-- Successor Apple A9X

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 Apple A8X clocks with 1.50 GHz, has 3 CPU cores and can calculate 3 threads in parallel.

AMD Athlon II X4 651K Characteristic Apple A8X
4 Cores 3
4 Threads 3
normal Core architecture normal
No Hyperthreading No
Yes Overclocking ? No
3.00 GHz Frequency 1.50 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 Apple A8X
-- 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 Apple A8X
GPU frequency 0.45 GHz
-- GPU (Turbo) --
-- GPU Generation 5
Technology 20 nm
Max. displays 1
-- Compute units 32
-- Shader 256
No Hardware Raytracing No
No Frame Generation No
-- Max. GPU Memory 2 GB
-- 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 Apple A8X
No Codec h265 / HEVC (8 bit) No
No Codec h265 / HEVC (10 bit) No
No Codec h264 Decode
No Codec VP9 No
No Codec VP8 No
No Codec AV1 No
No Codec AVC Decode
No Codec VC-1 Decode
No Codec JPEG Decode / Encode

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 Apple A8X supports a maximum of 2 GB of memory with a maximum memory bandwidth of 12.8 GB/s enabled.

AMD Athlon II X4 651K Characteristic Apple A8X
DDR3-1333 Memory LPDDR3-1600
16 GB Max. Memory 2 GB
2 (Dual Channel) Memory channels 1 (Single Channel)
21.3 GB/s Max. Bandwidth 12.8 GB/s
No ECC No
4.00 MB L2 Cache 2.00 MB
-- L3 Cache 4.00 MB
2.0 PCIe version --
-- PCIe lanes --
-- PCIe Bandwidth --

Thermal Management

The AMD Athlon II X4 651K has a TDP of 100 W. The TDP of the Apple A8X is 8 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

AMD Athlon II X4 651K Characteristic Apple A8X
100 W TDP (PL1 / PBP) 8 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 Apple A8X is at 6.00 MB. The processor is manufactured in 20 nm.

AMD Athlon II X4 651K Characteristic Apple A8X
32 nm Technology 20 nm
Unknown Chip design Chiplet
x86-64 (64 bit) Instruction set (ISA) Armv8-A (64 bit)
MMX, 3DNow!, SSE3, SSE4a ISA extensions --
FM1 Socket --
AMD-V Virtualization None
No AES-NI No
Windows 10, Linux Operating systems iOS
Q4/2011 Release date Q3/2014
-- Release price --
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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks
AMD Athlon II X4 651K (100%)
Apple A8X (94%)
⌀ Multi core performance in 2 CPU benchmarks
AMD Athlon II X4 651K (100%)
Apple A8X (87%)

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%)
Apple A8X Apple A8X
3C 3T @ 1.50 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%)
Apple A8X Apple A8X
3C 3T @ 1.50 GHz
1075 (73%)

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%)
Apple A8X Apple A8X
3C 3T @ 1.50 GHz
2356 (100%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
Apple A8X Apple A8X
3C 3T @ 1.50 GHz
427 (100%)

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 Athlon II X4 651K AMD Athlon II X4 651K
4C 4T @ 3.00 GHz
0 (0%)
Apple A8X Apple A8X
3C 3T @ 1.50 GHz
959 (100%)

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 Athlon II X4 651K AMD Athlon II X4 651K
@ 0.00 GHz
0 (0%)
Apple A8X Apple A8X
Apple A8X @ 0.45 GHz
230 (100%)

Devices using this processor

AMD Athlon II X4 651K Apple A8X
Unknown Apple iPad Air 2

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