If you use a VPS for online and offline apps, you could come across a situation where they don't work correctly due to insufficient physical memory. This could occur if you try to run an application which requires additional RAM than the amount your package provides, or in the event that you have too many programs and some of them consume all of the memory, leaving no free RAM for the others. Even in case you get a powerful package, this may happen if you add more apps on the web server later on, and since it's possible that you shall need just more physical memory, but not higher CPU speeds or more disk space, our company offers a RAM upgrade which you could use without changing your whole plan. That way, you can pay only for the system resources which you really need and you shall be able to avoid errors on your sites caused by deficiency of memory and the inability of the Virtual Private Server to load the applications.