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Appendix A: DSP Requirements 53

appendix a

DSP Requirements

The number of TDM plug-ins you can use at one

time depends on how much DSP power is avail-

able in your system. Since the TDM hardware on

Pro Tools cards provide dedicated DSP for plug-

ins, plug-in performance isn’t limited by CPU

processing power.

The DSP tables in this appendix show the theo-

retical number of instances of each plug-in that

can be powered by a single DSP chip on

Pro Tools|HD cards. DSP usage differs according

to card type.

There are a total of nine DSP chips on a

Pro Tools|HD card (HD Core

®

, HD Process

®

, and

HD Accel). HD Core and HD Process cards pro-

vide identical chip sets. HD Accel cards provide

newer, more powerful DSP chips (making the

HD Accel card ideal for DSP-intensive plug-ins,

and for high sample rate sessions).

Not all plug-ins are supported on all types of

chips. The following tables indicate the number

of compatible chips per card.

Voice polyphony may be reduced by as much as

25% if all effects (chorus, phaser, reverb and de-

lay) are used simultaneously.

DSP tables show the theoretical maximum

performance when no other plug-ins or sys-

tem tasks (such as I/O) are sharing avail-

able DSP resources. You will typically use

more than one type of plug-in simulta-

neously. The data in these tables are pro-

vided as guidelines to help you gauge the

relative efficiency of different plug-ins on

your system. They are not guaranteed per-

formance counts that you should expect to

see in typical real-world sessions and usage.

Virus Indigo does not support 174.4 kHz or

192 kHz session sample rates on

Pro Tools|HD systems.

A maximum of four DSPs can be used for

Virus IndigoV40. This allows a maximum

total of 160 Virus Indigo voices on

Pro Tools|HD Accel systems.

A maximum of eight DSPs can be used for

Virus Indigo. This allows a maximum total

of 160 Virus Indigo voices on Pro Tools|HD

systems.

Systems with enough DSP to support both

Virus IndigoV40 and Virus Indigo allow a

maximum total of 320 voices.

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