It can’t run, but it will slow down a lot without ram.
Your computer uses a lot of different parts to function. One of the most important is the RAM – or random-access memory device that stores data while your computer is on and being used. Without enough RAM available to use, running the processor will become much more difficult, slowing things down immensely. Increasing your RAM will increase how quickly you’ll be able to use your computer! In any case, you should always back up all your files in an external hard drive for safekeeping each time before adding more RAM so you don’t wind up losing any files during installation if anything goes wrong.