- Unless you own a computer with a 64-bit processor, you cannot use a 64-bit operating system like Windows Vista Ultimate, according to Microsoft. In addition, if you are currently running a 32-bit version of Windows, you cannot upgrade to Vista Ultimate 64-bit.
- 64-bit operating systems such Vista Ultimate 64-bit are faster than 32-bit OSs because they can handle 128 gigabytes of RAM, while 32-bit systems are limited to 4 gigabytes, according to Microsoft. Thus, Vista Ultimate 64-bit should give you better performance than the 32-bit version as long as your computer meets the requirements.
- If you have a computer capable of running a 64-bit OS, consider purchasing Windows Vista Ultimate 64-bit, especially if you plan on installing 4 or more gigabytes of RAM. Older computers with a 32-bit architecture should opt for Vista Ultimate 32-bit, according to Microsoft.