Intel Core i7-7740X vs Intel Core i5-8400T. Specifications, performance, tests

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

• Segment
  Desktop / Server Desktop / Server
• Family
  Intel Core i7 Intel Core i5
• Generation
  7 8
• CPU group
  Intel Core i 7000X Intel Core i 8000
• Predecessor
  -- Intel Core i5-7400T
• Successor
  -- Intel Core i5-9400T

Basic parameters such as number of cores, number of threads, base and turbo frequency, and cache size. These parameters indirectly tell about the speed of the processor, the higher they are the better.

• Frequency
  4.30 GHz 1.70 GHz
• CPU Cores
  4 6
• Turbo (1 Core)
  4.50 GHz 3.30 GHz
• CPU Threads
  8 6
• Hyperthreading
  Yes No
• Overclocking
  Yes Yes
• Core architecture
  normal normal

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

• GPU name
  no iGPU Intel UHD Graphics 630
• GPU frequency
  0.35 GHz
• GPU (Turbo)
  No turbo 1.15 GHz
• Execution units
  24
• Shader
  192
• Max. GPU Memory
  -- 64 GB
• Max. displays
  3
• Generation
  9.5
• DirectX Version
  12
• Technology
  14 nm
• Release date
  Q4/2017

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

• h265 / HEVC (8 bit)
  No Decode / Encode
• h265 / HEVC (10 bit)
  No Decode / Encode
• h264
  No Decode / Encode
• VP9
  No Decode / Encode
• VP8
  No Decode / Encode
• AV1
  No No
• AVC
  No Decode / Encode
• VC-1
  No Decode
• JPEG
  No Decode / Encode

Types, channel quantity of RAM supported by Intel Core i5-8400T and Intel Core i7-7740X. Depending on the motherboards, higher or lower memory frequencies may be supported.

• Memory type
  DDR4-2666 DDR4-2666
• ECC
  No No
• Memory channels
  2 2
• PCIe version
  3.0 3.0
• PCIe lanes
  16 16

• AES-NI
  Yes Yes

Compare the TDP requirements of TDP Intel Core i7-7740X and Intel Core i5-8400T to select a cooling system. Note, the TDP value refers to thermal watts, not electrical watts.

• TDP (PL1)
  112 W 95 W

Architecture, interfaces, additional instructions supported by Intel Core i7-7740X and Intel Core i7-7740X, virtual machine technologies and process technology.

• Instruction set (ISA)
  x86-64 (64 bit) x86-64 (64 bit)
• Virtualization
  VT-x, VT-x EPT, VT-d VT-x, VT-x EPT, VT-d
• ISA extensions
  SSE4.1, SSE4.2, AVX2, AVX-512 SSE4.1, SSE4.2, AVX2
• L3-Cache
  8.00 MB 9.00 MB
• Architecture
  Skylake X Coffee Lake S
• Technology
  14 nm 14 nm
• Socket
  LGA 2066 LGA 1151-2
• Release date
  Q2/2017 Q2/2018