Macintosh Quadra 950


Family: Macintosh Quadra

Codename: Amazon, Zydeco

Gestalt ID: 26

Minimum OS: 7.1

Maximum OS: 8.1

Introduced: May 1992

Terminated: October 1995


CPU: Motorola MC68040

CPU Speed: 33 MHz

FPU: integrated

Bus Speed: 33 MHz

Register Width: 32-bit

Data Bus Width: 32-bit

Address Bus Width: 32-bit

Level 1 Cache: 4 kB data, 4 kB instruction


RAM Type: 30 pin SIMM

Minimum RAM Speed: 80 ns

Onboard RAM: 0 MB

RAM slots: 16

Maximum RAM: 256 MB

Expansion Slots: 5 NuBus, 1 PDS


VRAM: 1 MB - 2 MB (4 sockets)

Max Resolution: 1152x870

Video Out: DB-15


Hard Drive: 230 MB-1 GB

Floppy Drive: 1.4 MB SuperDrive

Optical Drive: 2x CD-ROM


ADB: 1

Serial: 2 Mini DIN-8


Audio Out: stereo 8 bit mini

Audio In: mono 8 bit mini

Speaker: mono


Ethernet: AAUI-15


Power: 303 Watts

Dimensions: 18.6" H x 8.9" W x 20.6" D

Weight: 36.8 lbs.

Announced in May 1992, the Quadra 950 was a "speed bump" of the Quadra 900. The processor was upgraded from a 25 MHz 68040 to a 33 MHz. The Quadra 950 sold for $7,200.

Picture Credits:

Date: Fri, 13 Oct 2000 03:10:01 -0700
From: Götz Hoffart

>CPU speed: 66 MHz

That's not quite right. The CPU uses a frequency speed of 33 MHz for all calculations. There is a 66 MHz frequency input port on the chip but this frequency is not used for code executing parts of the CPU. The 68040 is *not* capable of frequency-doubling like the Intel 80486DX-2 or later CPUs.

You may have a look at the M68k-FAQ of news://comp.sys.m68k or at the Motorola specifications.

Apple published ads for a long time praising "50 MHz" Performa 475s but after a law suit against them they had to pay 140 DEM (in Germany) to each who bought such a machine due to incorrect/false information about the machine which runs only at 25 MHz.

>L2 cache: n/a

No, it was "optional". There was the WGS95 PDS update card bringing 128-512 kB L2 cache to the WGS95, in addition to two extra SCSI DMA ports. I can send you a photo of this device if you're interested.

>SCSI: DB-25

The Q950 has two SCSI chains - one "fast SCSI" (up to 10 MB/s) and one "narrow/slow SCSI" (up to 5 MB/s).

>CD-ROM: 2x

It was optional as the DDS streamer drive was.

>Announced in May 1992, the Quadra 950 was a "speed bump" of the
>Quadra 900. The processor was upgraded from a 25 MHz 68040 to a 33

In addition the video was accelerated.