AMD Epyc 7251 vs AMD Epyc 7281. Specifications, performance, tests

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

• Segment
  Desktop / Server Desktop / Server
• Family
  AMD Epyc AMD Epyc
• Generation
  1 1
• CPU group
  AMD Epyc 7001 AMD Epyc 7001

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
  2.10 GHz 2.20 GHz
• CPU Cores
  8 16
• Turbo (1 Core)
  2.90 GHz 2.70 GHz
• CPU Threads
  16 32
• Hyperthreading
  Yes Yes
• Overclocking
  No 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 7281 and AMD Epyc 7251. Depending on the motherboards, higher or lower memory frequencies may be supported.

• Memory type
  DDR4-2666 DDR4-2666
• ECC
  Yes Yes
• Memory channels
  8 8
• PCIe version
  3.0 3.0
• PCIe lanes
  128 128

• AES-NI
  Yes Yes

Compare the TDP requirements of TDP AMD Epyc 7251 and AMD Epyc 7281 to select a cooling system. Note, the TDP value refers to thermal watts, not electrical watts.

• TDP (PL1)
  120 W 170 W

Architecture, interfaces, additional instructions supported by AMD Epyc 7251 and AMD Epyc 7251, 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
  32.00 MB 32.00 MB
• Architecture
  Naples (Zen) Naples (Zen)
• Technology
  14 nm 14 nm
• Socket
  SP3 SP3
• Release date
  Q3/2017 Q3/2017