Macintosh Quadra 900 (1991)
Macintosh Quadra 900 (1991): the other first Quadra and Apple’s first true tower: 68040 at 25 MHz, five NuBus slots, up to 256 MB of RAM, and built-in Ethernet.
Specs
| Release | 1991-10-21 |
| Chip | 68040 · 25 MHz |
| RAM | 4 MB standard · up to 256 MB (16 30-pin SIMMs, 80 ns) |
| Ports | 5 × NuBus · 1 × PDS · 1 × ADB · SCSI DB-25 · DB-15 · AAUI-15 |
| System | 7.0.1 → 8.1 |
| Weight | 16.7 kg |
| Dimensions | 472 × 226 × 523 mm |
| ROM | 1 MB |
| VRAM | Built-in: 1 MB expandable to 2 MB (VRAM SIMM) |
| Storage (detail) | 160 or 400 MB SCSI hard drive · 1.44 MB FDHD floppy |
| Video (detail) | Built-in video (DB-15); single display |
| Networking | Built-in Ethernet (AAUI-15) |
| Expansion slots | 5 × NuBus · 1 × PDS (040) |
Launch
Apple introduced it on October 21, 1991, alongside the Quadra 700, and it was sold only until May 18, 1992, when the Quadra 950 replaced it. Together with the 700 it was among the first 68040 Macintosh computers, and its tower chassis was a first for Apple. Dates and data: EveryMac; the introduction is also recorded in Apple Support and Apple’s Tech Info Library.
Marketing
The top of the series: five NuBus slots, sixteen SIMM sockets for up to 256 MB of RAM, and standard Ethernet (AAUI-15). With launch prices of $7,200 to $8,500 in the US depending on configuration, it was the most expensive Mac in the 1991 lineup. (EveryMac.)
Flaws and fixes
Apple documents no model-specific defects in the sources consulted. Limits that do appear in its spec sheet: 4 MB of standard RAM expandable to 256 MB via 16 30-pin SIMM slots (80 ns); a single display on the built-in video.
Indicative price
New (launch, US): $7,200–$8,500 depending on configuration · EveryMac
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Updated: October 29, 2026 · Sources: Apple Soporte · Apple Tech Info Library · EveryMac · Compare this product