Finding the market confused with five product lines (Mac II, Centris, Quadra, Performa, and PowerBook), Apple renamed the Centris models in October 1993. At the same time, the 68040 CPU in the Quadra 650 was boosted to 33 MHz.

The floppy drive mounting sled used in the Mac IIvi, IIvx, Performa 600, Centris 650, Quadra 650, and Power Mac 7100 can also be used for a hard drive if you no longer need the floppy drive.

See our NuBus Video Card Guide for information on adding a video card.

• Got a 68040-based Mac? Join our Vintage Macs Group.

Details

• introduced 1993.10.21; discontinued 1994.09.12
• requires System 7.1 or later; highest version supported without a PPC upgrade is Mac OS 8.1.
• CPU: 33 MHz 68040 CPU
• Performance: 14.6, relative to SE; 21.9, Speedometer 3; 1.19, Speedometer 4; 29 MIPS
  see Benchmarks: Quadra 650 for more details
• ROM: 1 MB
• RAM: 4 MB or 8 MB on motherboard, expandable to 132MB or 136MB using 80ns 72-pin SIMMs; motherboard had 4 SIMM slots which can be filled individually but should ideally be filled in interleaved pairs; can use 4 MB, 8 MB, 16 MB, and 32 MB SIMMs
• video: 512 KB VRAM, expandable to 1 MB
  • 512 x 384 @ 16-bit
  • 640 x 480, 800 x 600, 832 x 624: 8-bit @ 512 KB, 16-bit @ 1 MB
  • 832 x 624, 1024 x 768, 1152 x 870: 4-bit @ 512 KB, 8-bit @ 1 MB
• L2 cache: optional, PDS
• ADB: 2 ports for keyboard and mouse
• serial: 2 DIN-8 RS-422 ports on back of computer
• SCSI: DB-25 connector on back of computer
• Hard drive: 230 or 500 MB
• NuBus: 3 NuBus 90 slots
• one PDS slot
• size (HxWxD): 6.0″ x 13.0″ x 16.5″
• Weight: 25 lbs.
• PRAM battery: 3.6V half-AA
• Gestalt ID: 36
• addressing: 24-bit or 32-bit
• upgrade path: Power Mac PDS card, Power Mac 7100

Accelerators & Upgrades

• Chipping the Quadra
• Output Enablers 42-44 MHz clock accelerator
• MicroMac Speedy variable speed oscillator (to 38 MHz)
• Daystar Digital PowerPro 601, Apple Knowledge Base Archive. Runs at twice the speed of the original processor (50 MHz) and has a 1 MB level 2 cache (resource: Unofficial PowerPro 601 Page.
• Power Mac 7100
• Sonnet 100 MHz PowerPC 601 Presto PPC, discontinued

Online Resources

• See: Online resources and links for the Quadra 650

Cautions

• Apple discontinued support and parts orders for this model on 2001.10.15 (2001.10.22 in Canada). You may be able to find dealers with parts inventory either locally or on our parts and service list.
• You must have a “fat” system installed to use a PowerPC upgrade.
• Serial port normally restricted to 57.6 kbps; throughput with a 56k modem may be limited. See 56k modem page. For more information on Mac serial ports, read Macintosh Serial Throughput.

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