Quick Answer
For entry-level PC upgrades, a three-tier UPS plan runs: budget is an 800VA to 1000VA line-interactive unit (around R1,500 to R2,200), balanced is a 1500VA unit (around R2,800 to R3,500), and premium is a 2000VA+ unit with longer runtime (R4,000+). For an entry build, a 1000VA UPS gives enough time to save and shut down safely during a dip.
Budget tier: an 800VA to 1000VA unit
An 800VA to 1000VA line-interactive UPS (R1,500 to R2,200) suits an entry-level gaming or office PC pulling 250 to 400W, giving a few minutes to save work and shut down during a brief power interruption. It is compact and affordable, the right starting point for a first build.
Balanced tier: a 1500VA unit for more runtime
A 1500VA UPS (R2,800 to R3,500) gives longer runtime and headroom if you add a stronger GPU later. It comfortably backs a PC, monitor and router. This tier suits a build you expect to grow, offering a buffer beyond the bare minimum.
Premium tier: 2000VA+ for extended cover
A 2000VA+ unit (R4,000+) provides extended runtime, useful if you want longer to finish a task before shutting down or run a small setup briefly. For an entry-level upgrade, this is usually more than needed; the budget or balanced tier covers most. Match the UPS to your PC's draw and how long you want to keep working.
FAQ
What size UPS for an entry-level PC?
An 800VA to 1000VA line-interactive unit (R1,500 to R2,200) gives an entry build a few minutes to save and shut down during a power dip.
Do I need a bigger UPS if I upgrade my GPU?
A stronger GPU draws more power, shortening runtime. A 1500VA unit gives headroom for an upgraded build, so it is worth considering if you plan to grow the PC.
How long does a UPS run a PC?
A correctly sized UPS gives several minutes, enough to save work and shut down cleanly, not to keep gaming through an outage. Size it to your draw.
UPS to your system's real draw, then pick the tier. For entry-level PC upgrades, plug only the PC, monitor and router into the battery-backed sockets for the longest useful runtime.