CPU voltage

IO / core
VRM (Voltage Regulation Module)
VRM 8.2 specification intel
VRM 8.4 specification intel
VRM 8.5 specification intel
12V, 5V, 3.5V, 3.35V, 3.4V, 3.0V, 2.8V, 2.0V, 1.8V
Single / Dual Voltage

SpeedStep™ ('Geyserville') by intel
  SpeedStep utility v1.1
  SpeedStep utility v1.3
  SpeedStep utility v2.1
Enhanced SpeedStep™ by intel
  DeeperSleep Alert
IMVP intel mobile voltage positioning
PowerNow!™ by AMD (codename 'Gemini')
Long Haul™ by VIA
Long Run™ by Transmeta