Written 27 Aug 2026. This is a how-to, not a product card. Buy links are not tagged yet.

See how much memory the leftover box already has

Before you buy a tiny computer, check how much memory the leftover box already has.

Memory is the leftover box's short-term workspace. Not the disk. Not free room when the box feels slow. That free look is see if the leftover box still has free memory. This note is the total size already installed, before you shop for an N100. Worker count is see how many workers the leftover box already has. You do not need a new mini this morning because the leftover laptop is old.

Skip until SSH works

If ping fails and SSH hangs, start with is the leftover box still on? If you have never logged in from the couch, that is SSH from the couch. Prefer this look after the leftover box is doing real work, before you shop: start with what you already have. This note assumes you can log in from the couch.

What this is

A look, not a shopping trip. You are reading how much memory the leftover box already has, so you know whether house ad block and a file share fit. You are not buying RAM sticks tonight. You are not buying an N100, an N150, or a Protectli this morning.

Ask how much memory it has

SSH in from the couch, then ask:

free -h

Point at the Mem line, total column. That is how much memory the leftover box already has. 4 GB is a tight leftover laptop. 8 GB is common and fine for Pi-hole plus a house share. 16 GB is comfortable. Do not buy a mini PC because total says 8G.

Optional one-line total

If you want one number without the full table:

grep MemTotal /proc/meminfo

That line is kilobytes. Divide by about a million for a rough gigabyte count, or stay with free -h if the table is clearer. Keep this light. Do not install extra tools for this look.

If the total is small

4 GB still runs the first lab if you keep the stack thin. If the leftover box feels slow, check see if the leftover box still has free memory and see what is keeping the leftover box busy before you shop. Free room and one busy copy squeeze a leftover laptop more often than a low total. Worker count stays see how many workers the leftover box already has. Whether the leftover box can run a pretend computer is see if the leftover box can run a pretend computer. A later leftover-next mini is a tiny computer you can leave on, with the RAM shopping rule in buy RAM you can add later; skip soldered 12 GB cubes, when the leftover box is actually in the way. Skip buying one this morning because total said 4G.

What next

Free room when it feels slow stays see if the leftover box still has free memory. Worker count stays see how many workers the leftover box already has. The VM flag look is see if the leftover box can run a pretend computer. The leftover computer name is see what leftover computer you already have. Overflow memory on the leftover disk is see if the leftover box already has extra memory on disk. The leftover disk size is see how big the leftover box disk already is. The leftover-first rule stays start with what you already have. The later buy is a tiny computer you can leave on, when you actually need it.

Skip

Skip if SSH fails. That is is the leftover box still on? or SSH from the couch.
Skip buying an N100 because free -h total printed 4G or 8G.
Skip stacking a movie library, a VM, and Pi-hole on 4 GB, then blaming the leftover box.
Skip buying RAM sticks for a soldered leftover laptop. That trap is buy RAM you can add later; skip soldered 12 GB cubes.
Skip a NAS for this look.
Skip Proxmox tonight. That is what a VM is, and when you do not need one.

Sources

Debian: free. Ubuntu: free. Debian: proc. Official pages only. For free room when the box feels slow, see see if the leftover box still has free memory. For worker count, see see how many workers the leftover box already has. For the leftover-first rule, see start with what you already have. A leftover-next mini is later: a tiny computer you can leave on and buy RAM you can add later; skip soldered 12 GB cubes. For the login, see SSH from the couch.

Also on this topic

See how many workers the leftover box already hasBefore you buy a tiny computer, check how many workers the leftover box already has. See if the leftover box still has free memoryThe leftover box feels slow. Check free memory before you buy a new mini PC. See if the leftover box can run a pretend computerBefore you buy a tiny computer for Proxmox, check whether the leftover box already has the CPU feature for VMs. See if the leftover box already has extra memory on diskBefore you buy a tiny computer, check whether the leftover box already has overflow memory on the disk. See how big the leftover box disk already isBefore you buy a tiny computer or a NAS, check how big the leftover box disk already is. Start with what you already haveDo not buy anything yet. Old laptop first, or a retired OptiPlex from Marketplace. Buy RAM you can add later; skip soldered 12 GB cubesBuy enough memory you can actually add later. Soldered RAM means memory you cannot add later. Skip 12 GB cubes. 16 GB is the floor for a leftover-next mini. A tiny computer you can leave onDo not buy one of these first. Use the old laptop, or a retired OptiPlex from Marketplace. These quiet little PCs are the later buy, when you know you will leave a box on and you want it small and silent.