Intel Core i5-6600K vs Intel Core i5-8400. Specifications, performance, tests

Background information about the processors being compared, series, generation and market segment.

• CPU group
  Intel Core i 6000 Intel Core i 8000
• Family
  Intel Core i5 Intel Core i5
• Generation
  6 8
• Predecessor
  - Intel Core i5-7400
• Segment
  Desktop / Server Desktop / Server
• Successor
  Intel Core i5-7600K Intel Core i5-9400

Core counts, threads, cache and clock modes describe the CPU configuration. Performance depends on the workload and comparable measured results.

• Base Frequency
  3.5 GHz 2.8 GHz
• Core architecture
  normal normal
• CPU Cores
  4 6
• CPU Threads
  4 6
• Hyperthreading / SMT
  No No
• Overclocking
  Yes No
• Turbo Frequency (1 Core)
  3.9 GHz 4 GHz
• Turbo Frequency (4 Cores)
  3.6 GHz -
• Turbo Frequency (6 Cores)
  - 3.8 GHz

Internal Graphics does not affect the performance of the CPU, performs the work of the graphics card in its absence or on mobile devices.

• DirectX Version
  12 12
• Execution units
  24 24
• Generation
  9 9.5
• GPU Frequency
  350 MHz 350 MHz
• GPU name
  Intel HD Graphics 530 Intel UHD Graphics 630
• GPU Turbo
  1150 MHz 1150 MHz
• Max. displays
  3 3
• Max. GPU Memory
  64 GB 64 GB
• Release date
  Q3/2015 Q4/2017
• Shader
  192 192
• Technology
  14 nm 14 nm

Built-in codecs used to encode and decode content. Significantly speeds up the required operations.

• AV1
  No No
• H.264 / AVC
  Decode / Encode Decode / Encode
• h265 / HEVC (8 bit)
  Decode / Encode Decode / Encode
• h265 / HEVC (10 bit)
  Decode Decode / Encode
• JPEG
  Decode / Encode Decode / Encode
• VC-1
  Decode Decode
• VP8
  Decode / Encode Decode / Encode
• VP9
  Decode Decode / Encode

Types, channel quantity of RAM supported by Intel Core i5-8400 and Intel Core i5-6600K. Depending on the motherboards, higher or lower memory frequencies may be supported.

• ECC
  No No
• Max. Memory
  64 GB 128 GB
• Memory channels
  2 2
• Memory type
  DDR3-1600DDR4-2133 DDR4-2666
• PCIe lanes
  16 16
• PCIe version
  3.0 3.0

• AES-NI
  Yes Yes

Compare the TDP requirements of TDP Intel Core i5-6600K and Intel Core i5-8400 Power specifications describe different manufacturer limits. TDP, base power and maximum turbo power are separate values; they do not establish measured system consumption.

• TDP (PL1, legacy label)
  91 W 65 W

Architecture, interfaces, additional instructions supported by Intel Core i5-6600K and Intel Core i5-8400, virtual machine technologies and process technology.

• Architecture
  Skylake S Coffee Lake S
• Instruction set (ISA)
  x86-64 (64 bit) x86-64 (64 bit)
• ISA extensions
  SSE4.1, SSE4.2, AVX2 SSE4.1, SSE4.2, AVX2
• L3-Cache
  6 MB 9 MB
• Release date
  Q3/2015 Q4/2017
• Socket
  LGA 1151 LGA 1151-2
• Technology
  14 nm 14 nm
• Virtualization
  VT-x, VT-x EPT, VT-d VT-x, VT-x EPT, VT-d