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Replacing PC with NeXTcube?

is replacing my main PC with a NeXTcube a good idea?
Short answer: No—unless your goal is specifically to collect or experiment with a historic machine, a NeXTcube is a terrible day-to-day replacement for a modern PC.
Why it fails as a “main” computer today
  1. 30-year-old hardware
    25 MHz 68040, 16–64 MB RAM, 400 MB SCSI disk (if you’re lucky), no built-in Ethernet, no USB, no Wi-Fi, no audio-in, 2-bit grayscale display. You will feel the slowness in everything from un-zipping a file to loading a web page.
  2. Obsolete software base
    NeXTSTEP 3.3 is gorgeous but frozen in 1995. No modern browser build, no TLS 1.3, no video codecs past MPEG-1, no Dropbox/OneDrive/Zoom/Slack/Steam/Spotify. You can ssh out, but you can’t run contemporary apps.
  3. Storage and connectivity pain
    SCSI-2 drives are dying; 50-pin replacements cost more per GB than a 4-TB NVMe stick. Getting files on/off the machine usually involves FTP-over-Ethernet or burning a CD-ROM on another computer.
  4. No security updates
    The last patch was released before the commercial web really existed. Putting it on the open Internet is asking to be scanned and possibly exploited within minutes.
  5. Display and peripherals
    The original 17" NeXT MegaPixel monitor is fixed-frequency 1120×832@68 Hz grayscale. Adapters to VGA exist, but color is impossible and refresh rates annoy modern LCDs. Sound is 16-bit 22 kHz mono; the optical drive is a 660 MB magneto-optical cartridge.
  6. Power and parts
    The cube power supply is a custom 350 W linear unit that runs hot; capacitors are drying out. When it dies you will be scavenging eBay or recapping it yourself. Spare motherboards cost more than a whole used ThinkPad.
  7. Productivity software
    There are serviceable versions of Mathematica, FrameMaker, Lotus Improv and OmniWeb 3.x, but file-format compatibility stops at Office 97-era documents. You will constantly round-trip files through another machine.
What it is good for
  • Historical research, museum exhibits, retro-programming in Objective-C 1.0 or 68k assembly.
  • Demonstrating the birth of the World-Wide Web (Tim Berners-Lee’s first server ran on a NeXT).
  • Enjoying the UI that later became macOS (AppKit, Dock, Services, .app bundles).
  • Collecting: a working color NeXTcube with turbo slab and original laser printer is a conversation piece worth several thousand dollars.
Practical compromise
Keep your modern PC (or a quiet mini-PC/Mac mini) for real work and run a NeXT emulator instead:
  • Previous (68k emulator) boots NeXTSTEP 3.3 on macOS or Linux.
  • VirtualNeXT (based on Previous) for Windows.
  • QEMU’s “next” target is improving.
You get the look-and-feel, can compile legacy code, and still have 4K video calls when you need them.
Bottom line
A NeXTcube is a beautiful, important machine—buy one if you love vintage hardware—but do not voluntarily make it the computer you rely on to pay bills, join Zoom meetings, or play YouTube.