AMD Ryzen 5 8400F vs Intel Core i9 9940X

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We compared two desktop CPUs: AMD Ryzen 5 8400F with 6 cores 4.2GHz and Intel Core i9 9940X with 14 cores 3.3GHz . You will find out which processor performs better in benchmark tests, key specifications, power consumption and more.

Main Differences

AMD Ryzen 5 8400F 's Advantages

Released 5 years and 6 months late

Higher specification of memory (DDR5-5200 vs DDR4-2666)

Newer PCIe version (4 vs 3.0)

Higher base frequency (4.2GHz vs 3.3GHz)

Lower TDP (65W vs 165W)

Intel Core i9 9940X 's Advantages

Larger memory bandwidth (85GB/s vs 83.2GB/s)

Larger L3 cache size (20MB vs 16MB)

Score

Benchmark

Cinebench R23 Single Core

AMD Ryzen 5 8400F +37%

1691

Intel Core i9 9940X

1228

Cinebench R23 Multi Core

AMD Ryzen 5 8400F

13361

Intel Core i9 9940X +14%

15351

AMD Ryzen 5 8400F

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Intel Core i9 9940X

General Parameters

Apr 2024

Release Date

Oct 2018

AMD

Manufacturer

Intel

Desktop

Type

Desktop

-

Instruction Set

x86-64

Phoenix

Core Architecture

Skylake

-

Processor Number

i9-9940X

AMD Socket AM5

Socket

LGA-2066

N/A

Integrated Graphics

N/A

Ryzen 5 (Zen 4 (Phoenix))

Generation

-

Package

25 billions

Transistor Count

-

4 nm

Manufacturing Process

14 nm

AMD Socket AM5

Socket

LGA-2066

65 W

Power Consumption

165 W

-

Peak Operating Temperature

88 °C

TSMC

Foundry

-

178 mm²

Die Size

-

FC-LGA1718

Package

-

CPU Performance

-

Performance Cores

14

-

Performance Core Threads

28

4.2 GHz

Performance Core Base Frequency

3.3 GHz

4.7 GHz

Performance Core Turbo Frequency

4.4 GHz

6

Total Core Count

14

12

Total Thread Count

28

100 MHz

Bus Frequency

100 MHz

42.0

Multiplier

33x

64 KB per core

L1 Cache

64 K per core

1 MB per core

L2 Cache

1 MB per core

16 MB

L3 Cache

20 MB shared

Yes

Unlocked Multiplier

Yes

1

SMP

-

Memory Parameters

DDR5-5200

Memory Types

DDR4-2666

256 GB

Max Memory Size

128 GB

2

Max Memory Channels

4

83.2 GB/s

Max Memory Bandwidth

85 GB/s

No

ECC Memory Support

No

Miscellaneous

AMD Ryzen 5 8400F

Official Website

Intel Core i9 9940X

4

PCIe Version

3.0

20

PCIe Lanes

44

-

Extended Instruction Set

SSE4.1, SSE4.2, AVX-2, AVX-512

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