Qualcomm Snapdragon 8cx vs AMD Ryzen 9 4900U

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CPU comparison with benchmarks


Qualcomm Snapdragon 8cx CPU1 vs CPU2 AMD Ryzen 9 4900U
Qualcomm Snapdragon 8cx AMD Ryzen 9 4900U

CPU comparison

In this CPU comparison, we compare the Qualcomm Snapdragon 8cx and the AMD Ryzen 9 4900U and use benchmarks to check which processor is faster.

We compare the Qualcomm Snapdragon 8cx 8 core processor released in Q4/2018 with the AMD Ryzen 9 4900U which has 8 CPU cores and was introduced in Q1/2020.
Qualcomm Snapdragon (102) Family AMD Ryzen 9 (34)
Qualcomm Snapdragon 8cx (2) CPU group AMD Ryzen 4000U (11)
2 Generation 3
Kryo 495 Architecture Renoir (Zen 2)
Mobile Segment Mobile
-- Predecessor --
-- Successor --

CPU Cores and Base Frequency

The Qualcomm Snapdragon 8cx is a 8 core processor with a clock frequency of 2.84 GHz. The processor can compute 8 threads at the same time. The AMD Ryzen 9 4900U clocks with 2.00 GHz (4.40 GHz), has 8 CPU cores and can calculate 16 threads in parallel.

Qualcomm Snapdragon 8cx Characteristic AMD Ryzen 9 4900U
8 Cores 8
8 Threads 16
hybrid (big.LITTLE) Core architecture normal
No Hyperthreading Yes
No Overclocking ? No
2.84 GHz
4x Kryo 495 Gold
A-Core 2.00 GHz (4.40 GHz)
1.80 GHz
4x Kryo 495 Silver
B-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.

Qualcomm Snapdragon 8cx Characteristic AMD Ryzen 9 4900U
Qualcomm AI engine AI hardware --
Hexagon 685 @ 3 TOPS 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.

Qualcomm Adreno 680 GPU AMD Radeon RX Vega 8 (Renoir)
0.25 GHz GPU frequency 0.40 GHz
0.59 GHz GPU (Turbo) 1.75 GHz
5 GPU Generation 9
7 nm Technology 7 nm
2 Max. displays 3
8 Compute units 8
768 Shader 512
No Hardware Raytracing No
No Frame Generation No
4 GB Max. GPU Memory 8 GB
12.0 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.

Qualcomm Adreno 680 GPU AMD Radeon RX Vega 8 (Renoir)
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 Codec VP9 Decode / Encode
Decode / Encode Codec VP8 Decode / Encode
No Codec AV1 No
Decode Codec AVC Decode / Encode
Decode Codec VC-1 Decode
Decode / Encode Codec JPEG Decode / Encode

Memory & PCIe

Up to 16 GB of memory in a maximum of 8 memory channels is supported by the Qualcomm Snapdragon 8cx, while the AMD Ryzen 9 4900U supports a maximum of 64 GB of memory with a maximum memory bandwidth of 51.2 GB/s enabled.

Qualcomm Snapdragon 8cx Characteristic AMD Ryzen 9 4900U
LPDDR4X-4266 Memory LPDDR4-4266, DDR4-3200
16 GB Max. Memory 64 GB
8 (Octa Channel) Memory channels 2 (Dual Channel)
68.2 GB/s Max. Bandwidth 51.2 GB/s
No ECC Yes
-- L2 Cache --
2.00 MB L3 Cache 8.00 MB
-- PCIe version 3.0
-- PCIe lanes 12
-- PCIe Bandwidth 11.8 GB/s

Thermal Management

The Qualcomm Snapdragon 8cx has a TDP of 7 W. The TDP of the AMD Ryzen 9 4900U is 15 W. System integrators use the TDP of the processor as a guide when dimensioning the cooling solution.

Qualcomm Snapdragon 8cx Characteristic AMD Ryzen 9 4900U
7 W TDP (PL1 / PBP) 15 W
-- TDP (PL2) --
-- TDP up 25 W
-- TDP down 10 W
-- Tjunction max. 105 °C

Technical details

The Qualcomm Snapdragon 8cx has 2.00 MB cache and is manufactured in 7 nm. The cache of AMD Ryzen 9 4900U is at 8.00 MB. The processor is manufactured in 7 nm.

Qualcomm Snapdragon 8cx Characteristic AMD Ryzen 9 4900U
7 nm Technology 7 nm
Chiplet Chip design Chiplet
Armv8-A (64 bit) Instruction set (ISA) x86-64 (64 bit)
-- ISA extensions SSE4a, SSE4.1, SSE4.2, AVX2, FMA3
-- Socket FP6
None Virtualization AMD-V, SVM
No AES-NI Yes
Android, Windows 10 (ARM) Operating systems Windows 10, Windows 11, Linux
Q4/2018 Release date Q1/2020
-- Release price --
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Average performance in benchmarks

⌀ Single core performance in 1 CPU benchmarks
⌀ Multi core performance in 1 CPU benchmarks

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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
724 (60%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 4.40 GHz
1203 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
2808 (44%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 3.40 GHz
6422 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
Qualcomm Adreno 680 @ 0.59 GHz
1843 (100%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
AMD Radeon RX Vega 8 (Renoir) @ 1.75 GHz
1792 (97%)

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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
0 (0%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 4.40 GHz
1279 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
0 (0%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 4.40 GHz
501 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
0 (0%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 3.40 GHz
3292 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
0 (0%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 4.40 GHz
204 (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.
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
0 (0%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 3.40 GHz
1384 (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).
Qualcomm Snapdragon 8cx Qualcomm Snapdragon 8cx
8C 8T @ 2.84 GHz
3 (100%)
AMD Ryzen 9 4900U AMD Ryzen 9 4900U
8C 16T @ 2.00 GHz
0 (0%)

Devices using this processor

Qualcomm Snapdragon 8cx AMD Ryzen 9 4900U
Lenovo Flex 5G
Lenovo Yoga C 5G
Samsung Galaxy Book S
Unknown

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