The Macintosh Quadra 950 is a Motorola 68040 and NuBus based tower. This model was released in March 1992 and discontinued in October 1995. This model replaces the Macintosh Quadra 900, and was the last model to feature 6 expansion slots until the Power Macintosh 9500.
Announced in May 1992, the Quadra 950 was a "speed bump" of the Macintosh Quadra 900. The processor was upgraded from a 25 Mhz 68040 to a 33 Mhz. The Quadra 950 sold for $7,200.
The video RAM (VRAM) in the Macintosh Quadra 950 uses 80 ns devices instead of the 100 ns devices used in the Macintosh Quadra 900. The video controller (DAFB) has been reprogrammed to take advantage of the faster VRAM, speeding up video performance by as much as 20%. That speed increase is in addition to the increase due to the 33 MHz processor speed. The cumulative increase in video performance can be as much as 50% overall.
Like the Macintosh Quadra 900, the Macintosh Quadra 950 comes with 1 MB of video RAM (VRAM) and sockets for expanding the VRAM to a total of 2 MB. The 1-MB VRAM configuration supports up to 24 bits per pixel on Apple’s 12-inch RGB monitor, 16 bits per pixel on the 13-inch and 16-inch RGB monitors, and 8 bits per pixel on 21-inch Apple monitors. The 2-MB VRAM configuration supports up to 24 bits per pixel on Apple’s 12-inch, 13-inch, and 16-inch RGB monitors and 16 bits per pixel on Apple’s 21-inch RGB monitor. The Macintosh Quadra 950 also supports 19-inch monitors with 1024 by 768 pixel displays. With 2 MB of VRAM, the Macintosh Quadra 950 supports up to 16 bits per pixel on such monitors.
The PDS attaches to the pins of the MC68040 without any buffers. For a PDS card to operate properly in the Macintosh Quadra 950 , the card must be capable of meeting the 33 MHz timing specifications of the MC68040.
- The Quadra 950 is an ideal server tower for Apple UNIX (A/UX) due to the expansion options.