AMD Ryzen Threadripper 3990X vs AMD Epyc 7742. Specifications, performance, tests

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

• Segment
  Desktop / Server Desktop / Server
• Family
  AMD Ryzen AMD Epyc
• Generation
  3 2
• CPU group
  AMD Ryzen Threadripper 3000 AMD Epyc 7002

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
  2.90 GHz 2.25 GHz
• CPU Cores
  64 64
• Turbo (1 Core)
  4.30 GHz 3.40 GHz
• CPU Threads
  128 128
• Turbo (64 Cores)
  3.20 GHz 2.80 GHz
• Hyperthreading
  Yes Yes
• Overclocking
  Yes No
• 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 no iGPU
• GPU (Turbo)
  No turbo No turbo

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

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

Types, channel quantity of RAM supported by AMD Epyc 7742 and AMD Ryzen Threadripper 3990X. Depending on the motherboards, higher or lower memory frequencies may be supported.

• Memory type
  DDR4-3200 DDR4-3200
• Max. Memory
  2048 GB
• ECC
  Yes Yes
• Memory channels
  4 8
• PCIe version
  4.0 4.0
• PCIe lanes
  72 128

• AES-NI
  Yes Yes

Compare the TDP requirements of TDP AMD Ryzen Threadripper 3990X and AMD Epyc 7742 to select a cooling system. Note, the TDP value refers to thermal watts, not electrical watts.

• TDP (PL1)
  280 W 225 W
• Tjunction max.
  95 °C --

Architecture, interfaces, additional instructions supported by AMD Ryzen Threadripper 3990X and AMD Ryzen Threadripper 3990X, virtual machine technologies and process technology.

• Instruction set (ISA)
  x86-64 (64 bit) x86-64 (64 bit)
• Virtualization
  AMD-V, SVM AMD-V, SVM
• ISA extensions
  SSE4a, SSE4.1, SSE4.2, AVX2, FMA3 SSE4a, SSE4.1, SSE4.2, AVX2, FMA3
• L3-Cache
  256.00 MB 256.00 MB
• Architecture
  Castle Peak (Zen 2) Rome (Zen 2)
• Technology
  7 nm 7 nm
• Socket
  TRX4 (sTRX4) SP3
• Release date
  Q1/2020 Q3/2019