Intel Core i5-8400 vs Intel Core i9-9900T. Specifications, performance, tests

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

• Segment
  Desktop / Server Desktop / Server
• Family
  Intel Core i5 Intel Core i9
• Generation
  8 9
• CPU group
  Intel Core i 8000 Intel Core i 9000
• Predecessor
  Intel Core i5-7400 --
• Successor
  Intel Core i5-9400 Intel Core i9-10900T

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
  2.80 GHz 2.10 GHz
• CPU Cores
  6 8
• Turbo (1 Core)
  4.00 GHz 4.40 GHz
• CPU Threads
  6 16
• Hyperthreading
  No Yes
• Overclocking
  No 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
  Intel UHD Graphics 630 Intel UHD Graphics 630
• GPU frequency
  0.35 GHz 0.35 GHz
• GPU (Turbo)
  1.15 GHz 1.20 GHz
• Execution units
  24 24
• Shader
  192 192
• Max. GPU Memory
  64 GB 64 GB
• Max. displays
  3 3
• Generation
  9.5 9.5
• DirectX Version
  12 12
• Technology
  14 nm 14 nm
• Release date
  Q4/2017 Q4/2017

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

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

Types, channel quantity of RAM supported by Intel Core i9-9900T and Intel Core i5-8400. Depending on the motherboards, higher or lower memory frequencies may be supported.

• Memory type
  DDR4-2666 DDR4-2666
• Max. Memory
  128 GB 128 GB
• 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 i5-8400 and Intel Core i9-9900T to select a cooling system. Note, the TDP value refers to thermal watts, not electrical watts.

• TDP (PL1)
  65 W 35 W
• Tjunction max.
  -- 100 °C

Architecture, interfaces, additional instructions supported by Intel Core i5-8400 and Intel Core i5-8400, 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 SSE4.1, SSE4.2, AVX2
• L3-Cache
  9.00 MB 16.00 MB
• Architecture
  Coffee Lake S Coffee Lake S Refresh
• Technology
  14 nm 14 nm
• Socket
  LGA 1151-2 LGA 1151-2
• Release date
  Q4/2017 Q2/2019