Ryzen 9 5900X vs A6-6400K

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Aggregate performance score

A6-6400K
2013
2 cores / 2 threads, 65 Watt
0.95
Ryzen 9 5900X
2020
12 cores / 24 threads, 105 Watt
24.72
+2502%

Ryzen 9 5900X outperforms A6-6400K by a whopping 2502% based on our aggregate benchmark results.

Primary details

Comparing A6-6400K and Ryzen 9 5900X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking2501201
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluationno data30.64
Market segmentDesktop processorDesktop processor
SeriesAMD A-Series (Desktop)AMD Ryzen 9
Power efficiency1.3822.19
Architecture codenameRichland (2013−2014)Vermeer (Zen3) (2020−2022)
Release date1 June 2013 (11 years ago)8 October 2020 (4 years ago)
Launch price (MSRP)no data$549

Cost-effectiveness evaluation

Performance per price, higher is better.

no data

Detailed specifications

A6-6400K and Ryzen 9 5900X basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores2 (Dual-core)12 (Dodeca-Core)
Threads224
Base clock speed3.9 GHz3.7 GHz
Boost clock speed4.1 GHz4.8 GHz
Multiplierno data37
L1 cache96 KB768 KB
L2 cache1024 KB6 MB
L3 cache0 KB64 MB
Chip lithography32 nm7 nm, 12 nm
Die size246 mm22x 74 mm2(CCD) + 125 mm2 (IOD)
Maximum core temperature70 °Cno data
Maximum case temperature (TCase)70 °C95 °C
Number of transistors1,178 million0 Million
64 bit support++
Windows 11 compatibility-+
Unlocked multiplier++

Compatibility

Information on A6-6400K and Ryzen 9 5900X compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration11
SocketFM2AM4
Power consumption (TDP)65 Watt105 Watt

Technologies and extensions

Technological solutions and additional instructions supported by A6-6400K and Ryzen 9 5900X. You'll probably need this information if you require some particular technology.

Instruction set extensionsMMX, SSE1-4a, AES, ABM, AVX, BMI1, AMD64, VT, EVP, Turbo Core 3.086x MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4A,-64, AMD-V, AES, AVX, AVX2, FMA3, SHA, Precision Boost 2
AES-NI++
FMAFMA4-
AVX++
PowerNow+-
PowerGating+-
VirusProtect+-
Precision Boost 2no data+

Virtualization technologies

Virtual machine speed-up technologies supported by A6-6400K and Ryzen 9 5900X are enumerated here.

AMD-V++
IOMMU 2.0+-

Memory specs

Types, maximum amount and channel quantity of RAM supported by A6-6400K and Ryzen 9 5900X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3-1866DDR4-3200
Maximum memory sizeno data128 GB
Max memory channels22
Maximum memory bandwidthno data51.196 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardAMD Radeon HD 8470D-
Number of pipelines192-
Enduro+-
Switchable graphics+-
UVD+-
VCE+-

Graphics interfaces

Available interfaces and connections of A6-6400K and Ryzen 9 5900X integrated GPUs.

DisplayPort+-
HDMI+-

Graphics API support

APIs supported by A6-6400K and Ryzen 9 5900X integrated GPUs, sometimes API versions are included.

DirectXDirectX® 11-

Peripherals

Specifications and connection of peripherals supported by A6-6400K and Ryzen 9 5900X.

PCIe version2.04.0

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

A6-6400K 0.95
Ryzen 9 5900X 24.72
+2502%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

A6-6400K 1504
Ryzen 9 5900X 39114
+2501%

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

A6-6400K 410
Ryzen 9 5900X 2209
+439%

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

A6-6400K 576
Ryzen 9 5900X 11961
+1977%

Cinebench 10 32-bit single-core

Cinebench R10 is an ancient ray tracing benchmark for processors by Maxon, authors of Cinema 4D. Its single core version uses just one CPU thread to render a futuristic looking motorcycle.

A6-6400K 3068
Ryzen 9 5900X 6828
+123%

Cinebench 10 32-bit multi-core

Cinebench Release 10 Multi Core is a variant of Cinebench R10 using all the processor threads. Possible number of threads is limited by 16 in this version.

A6-6400K 5079
Ryzen 9 5900X 52076
+925%

3DMark06 CPU

3DMark06 is a discontinued DirectX 9 benchmark suite from Futuremark. Its CPU part contains two scenarios, one dedicated to artificial intelligence pathfinding, another to game physics using PhysX package.

A6-6400K 2654
Ryzen 9 5900X 16438
+519%

Cinebench 11.5 64-bit multi-core

Cinebench Release 11.5 Multi Core is a variant of Cinebench R11.5 which uses all the processor threads. A maximum of 64 threads is supported in this version.

A6-6400K 2
Ryzen 9 5900X 42
+2417%

Cinebench 15 64-bit multi-core

Cinebench Release 15 Multi Core is a variant of Cinebench R15 which uses all the processor threads.

A6-6400K 149
Ryzen 9 5900X 2695
+1709%

Cinebench 15 64-bit single-core

Cinebench R15 (standing for Release 15) is a benchmark made by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version (sometimes called Single-Thread) only uses a single processor thread to render a room full of reflective spheres and light sources.

A6-6400K 88
Ryzen 9 5900X 250
+184%

Cinebench 11.5 64-bit single-core

Cinebench R11.5 is an old benchmark by Maxon, authors of Cinema 4D. It was superseded by later versions of Cinebench, which use more modern variants of Cinema 4D engine. The Single Core version loads a single thread with ray tracing to render a glossy room full of crystal spheres and light sources.

A6-6400K 0.83
Ryzen 9 5900X 3.14
+278%

TrueCrypt AES

TrueCrypt is a discontinued piece of software that was widely used for on-the-fly-encryption of disk partitions, now superseded by VeraCrypt. It contains several embedded performance tests, one of them being TrueCrypt AES, which measures data encryption speed using AES algorithm. Result is encryption speed in gigabytes per second.

A6-6400K 1
Ryzen 9 5900X 21.2
+2108%

x264 encoding pass 2

x264 Pass 2 is a slower variant of x264 video compression that produces a variable bit rate output file, which results in better quality since the higher bit rate is used when it is needed more. Benchmark result is still measured in frames per second.  

A6-6400K 11
Ryzen 9 5900X 191
+1605%

x264 encoding pass 1

x264 version 4.0 is a video encoding benchmark uses MPEG 4 x264 compression method to compress a sample HD (720p) video. Pass 1 is a faster variant that produces a constant bit rate output file. Its result is measured in frames per second, which means how many frames of the source video file were encoded per second.  

A6-6400K 57
Ryzen 9 5900X 335
+489%

Gaming performance

Pros & cons summary


Performance score 0.95 24.72
Recency 1 June 2013 8 October 2020
Physical cores 2 12
Threads 2 24
Chip lithography 32 nm 7 nm
Power consumption (TDP) 65 Watt 105 Watt

A6-6400K has 61.5% lower power consumption.

Ryzen 9 5900X, on the other hand, has a 2502.1% higher aggregate performance score, an age advantage of 7 years, 500% more physical cores and 1100% more threads, and a 357.1% more advanced lithography process.

The Ryzen 9 5900X is our recommended choice as it beats the A6-6400K in performance tests.


Should you still have questions on choice between A6-6400K and Ryzen 9 5900X, ask them in Comments section, and we shall answer.

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AMD A6-6400K
A6-6400K
AMD Ryzen 9 5900X
Ryzen 9 5900X

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