System Configuration : System Setup : System Usage : DSP Usage Meters

DSP Usage Meters
(Avid HDX and Pro Tools|HD Systems Only)
Avid HDX and Pro Tools|HD systems provide additional meters below the Activity meter (see page 85):
Voices Allocated
Displays the total number of TDM voices that can be allocated and the number of voices currently allocated. This includes all voices whether they are allocated explicitly or dynamically, as well as any voices used for routing host-based processing.
Time Slots Used
Displays the total number of TDM Time Slots available and the number of TDM Time Slots currently used.
DSP Usage (Avid HDX and Pro Tools|HD)
Displays (in percent) how much of each DSP chip on each Avid HDX or Pro Tools|HD card is currently being used for mixer configurations and DSP-based (AAX and TDM) plug-ins.