Intel Core i5-8400B vs Apple M3 (8-GPU)

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CPU comparison with benchmarks


Intel Core i5-8400B CPU1 vs CPU2 Apple M3 (8-GPU)
Intel Core i5-8400B Apple M3 (8-GPU)

CPU comparison

In this CPU comparison, we compare the Intel Core i5-8400B and the Apple M3 (8-GPU) and use benchmarks to check which processor is faster.

We compare the Intel Core i5-8400B 6 core processor released in Q2/2018 with the Apple M3 (8-GPU) which has 8 CPU cores and was introduced in Q4/2023.
Intel Core i5 (331) Family Apple M series (25)
Intel Core i 8000 (20) CPU group Apple M3 (6)
8 Generation 3
Coffee Lake S Architecture M3
Desktop / Server Segment Mobile
-- Predecessor Apple M2 (8-GPU)
-- Successor --

CPU Cores and Base Frequency

The Intel Core i5-8400B is a 6 core processor with a clock frequency of 2.80 GHz (3.80 GHz). The processor can compute 6 threads at the same time. The Apple M3 (8-GPU) clocks with 0.70 GHz (4.06 GHz), has 8 CPU cores and can calculate 8 threads in parallel.

Intel Core i5-8400B Characteristic Apple M3 (8-GPU)
6 Cores 8
6 Threads 8
normal Core architecture hybrid (big.LITTLE)
No Hyperthreading No
No Overclocking ? No
2.80 GHz (3.80 GHz) A-Core 0.70 GHz (4.06 GHz)
4x P-Core
-- B-Core 0.74 GHz (2.75 GHz)
4x E-Core

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.

Intel Core i5-8400B Characteristic Apple M3 (8-GPU)
-- AI hardware Apple Neural Engine
-- AI specifications 16 Neural cores @ 35 TOPS

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.

Intel UHD Graphics 630 GPU Apple M3 (8 Core)
0.35 GHz GPU frequency 0.39 GHz
1.15 GHz GPU (Turbo) 1.40 GHz
9.5 GPU Generation --
14 nm Technology 3 nm
3 Max. displays 2
24 Compute units 128
192 Shader 1024
No Hardware Raytracing Yes
No Frame Generation No
64 GB Max. GPU Memory 24 GB
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.

Intel UHD Graphics 630 GPU Apple M3 (8 Core)
Decode / Encode Codec h265 / HEVC (8 bit) Decode / Encode
Decode / Encode Codec h265 / HEVC (10 bit) Decode / Encode
Decode / Encode Codec h264 Decode / Encode
Decode / Encode Codec VP9 Decode / Encode
Decode / Encode Codec VP8 Decode
No Codec AV1 Decode
Decode / Encode Codec AVC Decode
Decode Codec VC-1 Decode
Decode / Encode Codec JPEG Decode / Encode

Memory & PCIe

Up to 64 GB of memory in a maximum of 2 memory channels is supported by the Intel Core i5-8400B, while the Apple M3 (8-GPU) supports a maximum of 24 GB of memory with a maximum memory bandwidth of 102.4 GB/s enabled.

Intel Core i5-8400B Characteristic Apple M3 (8-GPU)
DDR4-2666 Memory LPDDR5-6400
64 GB Max. Memory 24 GB
2 (Dual Channel) Memory channels 2 (Dual Channel)
42.7 GB/s Max. Bandwidth 102.4 GB/s
No ECC No
-- L2 Cache 20.00 MB
9.00 MB L3 Cache --
3.0 PCIe version 4.0
16 PCIe lanes --
15.8 GB/s PCIe Bandwidth --

Thermal Management

The Intel Core i5-8400B has a TDP of 65 W. The TDP of the Apple M3 (8-GPU) is 22 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

Intel Core i5-8400B Characteristic Apple M3 (8-GPU)
65 W TDP (PL1 / PBP) 22 W
-- TDP (PL2) --
-- TDP up --
-- TDP down 10 W
100 °C Tjunction max. 100 °C

Technical details

The Intel Core i5-8400B has 9.00 MB cache and is manufactured in 14 nm. The cache of Apple M3 (8-GPU) is at 20.00 MB. The processor is manufactured in 3 nm.

Intel Core i5-8400B Characteristic Apple M3 (8-GPU)
14 nm Technology 3 nm
Monolithic Chip design Chiplet
x86-64 (64 bit) Instruction set (ISA) Armv8-A (64 bit)
SSE4.1, SSE4.2, AVX2 ISA extensions Rosetta 2 x86-Emulation
BGA 1440 Socket --
VT-x, VT-x EPT, VT-d Virtualization Apple Virtualization Framework
Yes AES-NI Yes
Windows 10, Windows 11, Linux Operating systems macOS, iPadOS
Q2/2018 Release date Q4/2023
260 $ Release price --
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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.
Intel Core i5-8400B Intel Core i5-8400B
Intel UHD Graphics 630 @ 1.15 GHz
442 (16%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
Apple M3 (8 Core) @ 1.40 GHz
2840 (100%)

Cinebench 2024 (Single-Core)

The Cinebench 2024 benchmark is based on the Redshift rendering engine, which is also used in Maxon's 3D program Cinema 4D. The benchmark runs are each 10 minutes long to test whether the processor is limited by its heat generation.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 3.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
137 (100%)

Cinebench 2024 (Multi-Core)

The Multi-Core test of the Cinebench 2024 benchmark uses all cpu cores to render using the Redshift rendering engine, which is also used in Maxons Cinema 4D. The benchmark run is 10 minutes long to test whether the processor is limited by its heat generation.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 3.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
659 (100%)

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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 3.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
1965 (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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 4.00 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
10437 (100%)

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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 3.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
2150 (100%)

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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 4.00 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
10450 (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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 3.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
3125 (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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 4.00 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
11863 (100%)

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.
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 4.00 GHz
76 (100%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 4.06 GHz
0 (0%)

CPU performance per watt (efficiency)

Efficiency of the processor under full load in the Cinebench R23 (multi-core) benchmark. The benchmark result is divided by the average energy required (CPU package power in watts). The higher the value, the more efficient the CPU is under full load.
Intel Core i5-8400B Intel Core i5-8400B
2.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
10,437 CB R23 MC @ 22 W
474 (100%)

Performance for Artificial Intelligence (AI) and Machine Learning (ML)

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. The performance is given in the number (trillions) of arithmetic operations per second (TOPS).
Intel Core i5-8400B Intel Core i5-8400B
6C 6T @ 2.80 GHz
0 (0%)
Apple M3 (8-GPU) Apple M3 (8-GPU)
8C 8T @ 0.70 GHz
35 (100%)

Devices using this processor

Intel Core i5-8400B Apple M3 (8-GPU)
Unknown Apple iMac 24 (2023)

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