AMD Phenom II X4 840 vs AMD Phenom II X4 975. Specifications, performance, tests

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

• Segment
  Desktop / Server Desktop / Server
• Family
  AMD Phenom II AMD Phenom II
• Generation
  4 4
• CPU group
  AMD Phenom II - 800/900 AMD Phenom II - 800/900

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
  3.20 GHz 3.60 GHz
• CPU Cores
  4 4
• Turbo (1 Core)
  No turbo No turbo
• CPU Threads
  4 4
• Turbo (4 Cores)
  No turbo No turbo
• Hyperthreading
  No 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 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 Phenom II X4 975 and AMD Phenom II X4 840. Depending on the motherboards, higher or lower memory frequencies may be supported.

• Memory type
  DDR2-1066 DDR2-1066
• ECC
  No No
• Memory channels
  2 2

• AES-NI
  No No

Compare the TDP requirements of TDP AMD Phenom II X4 840 and AMD Phenom II X4 975 to select a cooling system. Note, the TDP value refers to thermal watts, not electrical watts.

• TDP (PL1)
  95 W 125 W

Architecture, interfaces, additional instructions supported by AMD Phenom II X4 840 and AMD Phenom II X4 840, virtual machine technologies and process technology.

• Instruction set (ISA)
  x86-64 (64 bit) x86-64 (64 bit)
• Virtualization
  AMD-V AMD-V
• ISA extensions
  SSE3, SSE4a SSE3, SSE4a
• L3-Cache
  2.00 MB 6.00 MB
• Architecture
  Deneb (K10) Deneb (K10)
• Technology
  45 nm 45 nm
• Socket
  AM3 AM3
• Release date
  Q1/2011 Q1/2011