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Ultimate is a larger edition than Professional. If you want to downgrade you will need to buy Professional and do a clean install.
Supported minimum size in computer terms is referred to as the minimum system requirements or recommended system requirements. These tell the minimum amount of memory and free disk space as well as the minimum processor speed you need on your computer to run a particular software program.
You need 30 address lines to access 1G of memory. 230 = 1,073,741,824. log2 (1,073,741,824) = 30.
There are numerous version of "Microsoft Windows" and the minimum memory requirements vary considerably between these versions : the official requirements range from 256 KB (Windows 1.0) to 1 GB (Windows 7 and Windows 8).
The minimum annual rainfall needed for agriculture field is 600 mm
Cache Memory is needed because Hardware implements cache as a block of memory for temporary storage likely to be used again.
A minimum amount of memory is needed depending on what you are trying to do. If you plan on saving a'lot of videos pictures and files on your computer than yes you will need a decent amount of memory. If your purpose is mostly to surf the internet and read email then you don't need a whole lot of memory.
in saskes but
The minimum number of seismographs needed to locate an epicenter of an earthquake is 3.
Isn't any minimum or maximum.
In order to free up space in memory, an operating system with a virtual memory capability transfers data that is not immediately needed from memory to the HDD; when that data is needed again, it is copied back into memory. That is, when all of the RAM is being used (e.g., if there are many programs open simultaneously or if one very large program is in use), a computer with virtual memory enabled will swap data to the HDD and back to memory as needed, thus, in effect, increasing the total system memory.