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===Memory===
 
===Memory===
 
RAM consists of dynamic random-access memory (DRAM) on 72-pin Single Inline Memory Modules (SIMMs). Each SIMM contains one or two banks of DRAM with up to 16 MB of capacity per bank. The DRAM in the Macintosh Quadra 840AV must have an access time of not more than 60 ns.
 
RAM consists of dynamic random-access memory (DRAM) on 72-pin Single Inline Memory Modules (SIMMs). Each SIMM contains one or two banks of DRAM with up to 16 MB of capacity per bank. The DRAM in the Macintosh Quadra 840AV must have an access time of not more than 60 ns.
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===Video===
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The Macintosh Quadra 840AV lets the user expand VRAM capacity by inserting 68-pin SIMM cards in its two VRAM expansion slots.
    
===DSP===
 
===DSP===
The Macintosh Quadra 840AV and Macintosh Centris 660AV computers include an AT&T DSP3210 32-bit floating-point digital signal processor (DSP). The DSP gives these computers the ability to perform fast, complex real-time data processing tasks, such as speech recognition, audio compression, analog modem signal processing, and so on. In the Macintosh Quadra 840AV, the DSP runs at 66.6667 MHz; in the Macintosh Centris 660AV, it runs at 55.5000 MHz. The DSP chip contains its own 8 KB of internal RAM, which minimizes its use of system memory.  
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The Macintosh Quadra 840AV and Macintosh Centris 660AV computers include an AT&T DSP3210 32-bit floating-point digital signal processor (DSP). The DSP gives these computers the ability to perform fast, complex real-time data processing tasks, such as speech recognition, audio compression, analog modem signal processing, and so on. In the Macintosh Quadra 840AV, the DSP runs at 66.6667 MHz; in the Macintosh Centris 660AV, it runs at 55.5000 MHz. The DSP chip contains its own 8 KB of internal RAM, which minimizes its use of system memory.
    
=Notes=
 
=Notes=

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