Quadra 900 and 950 can be inexpensively accelerated to speeds of at least 30Mhz or more & 40MHz or more respectively, using Newer Technology's "Variable Speed Overdrive™", part #s 7VS-A and 7VS-B.

Quadra 900 and 950 can be accelerated with Newer Technology's 
Cache 040™ 128K slotless cache card, part # 7CC128D–33.

Quadra 900 can be accelerated using Newer Technology's 50MHz "Meteor™”, part # 7QD-D or “Meteor+™", part # 7QDP-D.

Quadra 950 can be accelerated using Newer Technology's 50MHz "Meteor+™", part # 7QDP-F.

16 SIMM sockets.  Upgraded with four SIMMs at a time.

This computer comes with 1024K ROMs and an Apple 1.44MB SuperDrive.

Serial Port with the phone icon supports synchronous modems, with handshaking on both output and input supported.

Sound output is 8-bit stereo.

This computer has an international power supply.

This Mac contains an 040 Processor Direct Slot (PDS).  The WGS 95 has a special DMA SCSI/Cache card installed in it.

The Workgroup Server 95 (a derivative of the Quadra 900/950) can use “x9” parity memory.