NeXTcube Turbo

The NeXTcube Turbo was a high-end workstation computer developed, manufactured and sold by NeXT. It superseded the earlier NeXTcube workstation and was housed in the same cube-shaped magnesium enclosure. The workstation ran the NeXTSTEP operating system.

Source https://en.wikipedia.org/wiki/NeXTcube_Turbo