Specifications

Appendix F: TDM Mixing and DSP Usage 95
In Pro Tools|HD systems, the number of avail-
able mixers per DSP chip is based on the type of
card and session sample rate.
HD Accel (for PCI or PCIe) card, Standard mixers
Mixer
Sample Rate
(kHz)
Usage per Chip
Stereo 44.1 and 48 124x2
88.2 and 96 54x2
176.4 and 192 16x2
Surround, 5.1 44.1 and 48 46x6
88.2 and 96 34x6
176.4 and 192 8x6
Surround, 7.1 44.1 and 48 34x8
88.2 and 96 25x8
176.4 and 192 4x8
HD Accel card (for PCI or PCIe), Dithered mixers
Mixer
Sample Rate
(kHz)
Usage per Chip
Stereo
Dithered
44.1 and 48 113x2
88.2 and 96 54x2
176.4 and 192 16x2
Surround
Dithered, 5.1
44.1 and 48 44x6
88.2 and 96 27x6
176.4 and 192 8x6
Surround
Dithered, 7.1
44.1 and 48 34x8
88.2 and 96 20x8
176.4 and 192 4x8
HD card (for PCI), default Standard mixers
Mixer
Sample Rate
(kHz)
Usage per
Chip
Stereo 44.1, 48 68x2
88.2, 96 44x2
176.4, 192 16x2
Surround, 5.1 44.1, 48 22x6
88.2, 96 12x6
176.4, 192 4x6
Surround, 7.1 44.1, 48 16x8
88.2, 96 8x8
176.4, 192 2x8
HD card (for PCI), Dithered mixers
Mixer
Sample Rate
(kHz)
Usage per
Chip
Stereo
Dithered
44.1, 48 56x2
88.2, 96 34x2
176.4, 192 14x2
Surround
Dithered, 5.1
44.1, 48 19x6
88.2, 96 10x6
176.4, 192 1x6
Surround
Dithered, 7.1
44.1, 48 15x8
88.2, 96 7x8
176.4, 192 not supported