Author: W1zzard
Date: 2004-05-24 04:06:34

For overclockers

In the computer enthusiast world the terms are not fully defined. The most used meanings are following:
VCore: The core supply voltage of an 'important' chip like your CPU or GPU, usually not the Northbridge. Most frequently used to indicate CPU voltage.
VDD: The supply voltage to your Northbridge chip or the supply voltage for the input buffers and core logic of your memory chips (mostly on graphic cards).
VDDQ: The supply voltage to the output buffers of a memory chip.
VTT: Tracking Termination Voltage. Compared to VREF to determine Hi/Lo
VMem: Supply voltage to a memory chip.
VDDR, VDimm: Supply voltage to the memory on your motherboard.
VRef: Reference voltage for the input lines of a chip that determines the voltage level at which the threshold between a logical 1 and a logical 0 occurs. Usually 1/2 VDDQ.
VGPU: The supply voltage to your graphic card's processor.

Terms used by ATI internally:

VDDC: GPU Voltage
MVDDC: Memory Core Logic Voltage
MVDDQ: Memory Voltage supplied to the output buffers of the video card memory.
VTT: Termination Tracking voltage for video card memory.

Electrical Engineering Information

Positive voltages:
Vcc- Positive supply voltage of a Bipolar Junction Transistor.
Vdd- Positive supply voltage of A Field Effect Transistor

Negative voltages/ground:
Vee- Negative supply voltage of a Bipolar Junction Transistor.
Vss- Negative supply voltage of A Field Effect Transistor.




Discuss this article in our forums