Yes, Quadra 700 supports MacX. Basically, all Macintosh computers from
Macintosh Plus up to the Quadra 900 and PowerBooks with at least 2MB of RAM
and with system software version 6.0.5 or later supports MacX.
The Macintosh 512K may run MacX too if you can upgrade the third-party RAM
to at least 2MB. For color display, we recommend at least 4MB.