Comparing AMD Athlon II X4 638 vs AMD Athlon II X4 638

description_compare AMD Athlon II X4 638 and AMD Athlon II X4 651K

• Name
  AMD Athlon II X4 638 AMD Athlon II X4 651K
• Family
  AMD Athlon II AMD Athlon II
• CPU group
  AMD Athlon II X4 (Llano) AMD Athlon II X4 (Llano)
• Segment
  Desktop / Server Desktop / Server
• Generation
  2 2

CPU Cores and Base Frequency

• CPU Cores / Threads
  4 / 4 4 / 4
• Core architecture
  normal normal
• Cores
  4x 4x
• Hyperthreading / SMT
  No No
• Overclocking
  No Yes
• Frequency
  2.70 GHz 3.00 GHz

• GPU name
  no iGPU no iGPU
• GPU (Turbo)
  No turbo No turbo

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

• Memory type
  DDR3-1333 DDR3-1333
• Max. Memory
  16 GB 16 GB
• Memory channels
  2 (Dual Channel) 2 (Dual Channel)
• Bandwidth
  21.3 GB/s 21.3 GB/s
• ECC
  No No
• PCIe
  2.0 2.0
• AES-NI
  No No

• TDP (PL1)
  65 W 100 W

• Technology
  32 nm 32 nm
• Socket
  FM1 FM1
• L2-Cache
  4.00 MB 4.00 MB
• Architecture
  Llano Llano
• Operating systems
  Windows 10, Linux Windows 10, Linux
• Virtualization
  AMD-V AMD-V
• Instruction set (ISA)
  x86-64 (64 bit) x86-64 (64 bit)
• ISA extensions
  MMX, 3DNow!, SSE3, SSE4a MMX, 3DNow!, SSE3, SSE4a
• Release date
  Q1/2012 Q4/2011
• Part Number
  AD638XOJGXBOX --