5 Things to Know About RAM for Running Multiple VMs

16GB is the minimum, not the sweet spot Each virtual machine needs its own dedicated RAM. With 16GB total and two 4GB VMs, you have about 8GB left for the host OS and applications. That is workable but tight.

8GB is not enough for more than one VM With 8GB total, you can barely run one VM without heavy swapping. Running two or more will cause severe performance issues.

Three or more VMs will exhaust 16GB quickly If you run three or more VMs, or VMs that need 8GB each, 16GB will run out fast. You will need 32GB or more.

Host applications steal from your RAM pool Every program you keep open—browser tabs, Slack, development tools—uses RAM. That reduces what is available for your VMs.

32GB is the practical upgrade for serious VM work If you regularly run multiple VMs, skip 16GB and go straight to 32GB. It gives you breathing room for both VMs and host applications.