Intel Atom C3858 vs AMD Ryzen 5 8645HS

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CPU comparison with benchmarks


Intel Atom C3858 CPU1 vs CPU2 AMD Ryzen 5 8645HS
Intel Atom C3858 AMD Ryzen 5 8645HS

CPU comparison

Intel Atom C3858 or AMD Ryzen 5 8645HS - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results.

The Intel Atom C3858 has 12 cores with 12 threads and clocks with a maximum frequency of 2.00 GHz. Up to 256 GB of memory is supported in 2 memory channels. The Intel Atom C3858 was released in Q3/2017.

The AMD Ryzen 5 8645HS has 6 cores with 12 threads and clocks with a maximum frequency of 5.00 GHz. The CPU supports up to 256 GB of memory in 2 memory channels. The AMD Ryzen 5 8645HS was released in Q1/2024.
Intel Atom (108) Family AMD Ryzen 5 (86)
Intel Atom C3000 (20) CPU group AMD Ryzen 8040 (20)
5 Generation 7
Denverton Architecture Hawk Point (Zen 4)
Desktop / Server Segment Mobile
-- Predecessor --
-- Successor --

CPU Cores and Base Frequency

The Intel Atom C3858 is a 12 core processor with a clock frequency of 2.00 GHz. The AMD Ryzen 5 8645HS has 6 CPU cores with a clock frequency of 4.30 GHz (5.00 GHz).

Intel Atom C3858 Characteristic AMD Ryzen 5 8645HS
12 Cores 6
12 Threads 12
normal Core architecture normal
No Hyperthreading Yes
No Overclocking ? No
2.00 GHz Frequency 4.30 GHz
-- Turbo Frequency (1 Core) 5.00 GHz
-- 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.

Intel Atom C3858 Characteristic AMD Ryzen 5 8645HS
-- AI hardware AMD Ryzen™ AI
-- AI specifications AMD Ryzen™ AI (XDNA) @ 16 TOPS
-- NPU + CPU + iGPU --

Integrated graphics (iGPU)

The integrated graphics unit of a processor is not only responsible for the pure image output on the system, but can also significantly increase the efficiency of the system with the support of modern video codecs.

no iGPU GPU AMD Radeon 760M
GPU frequency 0.80 GHz
-- GPU (Turbo) 2.60 GHz
-- GPU Generation 10
Technology 4 nm
Max. displays 4
-- Compute units 8
-- Shader 512
No Hardware Raytracing Yes
No Frame Generation AMD FSR
-- Max. GPU Memory 32 GB
-- DirectX Version 12

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 AMD Radeon 760M
No Codec h265 / HEVC (8 bit) Decode / Encode
No Codec h265 / HEVC (10 bit) Decode / Encode
No Codec h264 Decode / Encode
No Codec VP9 Decode
No Codec VP8 Decode
No Codec AV1 Decode / Encode
No Codec AVC Decode
No Codec VC-1 Decode
No Codec JPEG Decode / Encode

Memory & PCIe

The Intel Atom C3858 supports a maximum of 256 GB of memory in 2 memory channels. The AMD Ryzen 5 8645HS can connect up to 256 GB of memory in 2 memory channels.

Intel Atom C3858 Characteristic AMD Ryzen 5 8645HS
DDR4-2400 Memory DDR5-4800, DDR5-5600, LPDDR5-6400, LPDDR5X-7500
256 GB Max. Memory 256 GB
2 (Dual Channel) Memory channels 2 (Dual Channel)
38.4 GB/s Max. Bandwidth 120.0 GB/s
Yes ECC Yes
12.00 MB L2 Cache 6.00 MB
-- L3 Cache 16.00 MB
3.0 PCIe version 4.0
16 PCIe lanes 20
15.8 GB/s PCIe Bandwidth 39.4 GB/s

Thermal Management

The TDP (Thermal Design Power) of a processor specifies the required cooling solution. The Intel Atom C3858 has a TDP of 25 W, that of the AMD Ryzen 5 8645HS is 45 W.

Intel Atom C3858 Characteristic AMD Ryzen 5 8645HS
25 W TDP (PL1 / PBP) 45 W
-- TDP (PL2) --
-- TDP up 54 W
-- TDP down 35 W
100 °C Tjunction max. 100 °C

Technical details

The Intel Atom C3858 has a 12.00 MB cache, while the AMD Ryzen 5 8645HS cache has a total of 22.00 MB.

Intel Atom C3858 Characteristic AMD Ryzen 5 8645HS
14 nm Technology 4 nm
Monolithic Chip design Monolithic
x86-64 (64 bit) Instruction set (ISA) x86-64 (64 bit)
SSE4.1, SSE4.2 ISA extensions SSE4a, SSE4.1, SSE4.2,FMA3, AVX2, AVX512
BGA 1310 Socket FP8
VT-x, VT-x EPT, VT-d Virtualization AMD-V, SVM
Yes AES-NI Yes
Windows 10, Linux Operating systems Windows 10, Windows 11, Linux
Q3/2017 Release date Q1/2024
332 $ Release price --
show more data show more data


Rate these processors

Here you can rate the Intel Atom C3858 to help other visitors make their purchasing decisions. The average rating is 0 stars (0 ratings). Rate now:
Here you can rate the AMD Ryzen 5 8645HS to help other visitors make their purchasing decisions. The average rating is 4.2 stars (9 ratings). Rate now:


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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 5.00 GHz
99 (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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 5.00 GHz
702 (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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 5.00 GHz
1802 (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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 4.30 GHz
7768 (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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 5.00 GHz
2478 (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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 4.30 GHz
10357 (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.
Intel Atom C3858 Intel Atom C3858
@ 0.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
AMD Radeon 760M @ 2.60 GHz
2663 (100%)

AI performance (NPU)

The performance values of the processor's AI unit. The isolated NPU performance is given here, the total AI performance (NPU+CPU+iGPU) can be higher.

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 Atom C3858 Intel Atom C3858
12C 12T @ 2.00 GHz
0 (0%)
AMD Ryzen 5 8645HS AMD Ryzen 5 8645HS
6C 12T @ 4.30 GHz
16 (100%)

Devices using this processor

Intel Atom C3858 AMD Ryzen 5 8645HS
Unknown Unknown

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