The English translation for "占内存" would be "to consume/take up memory" or "to occupy memory".
Some examples:
- This program is consuming a lot of memory on my computer.
- The large image file is occupying too much memory on the device.
- The software update seems to be taking up a significant amount of memory.
- The database application is consuming a large portion of the available memory.
The general idea is that "占内存" refers to the amount of computer memory or RAM that a particular program, file, or application is using or requiring.