More memory is available. This means that the processor is (if capable) can access 2^64 memory cells? But why, for example, in Windows available 3.5 GB of RAM, if 2^32=4 294 967 296 cells, which gives 4096 MB of memory?
1. The processor can access much more memory than 4GB in a x86.
2. If you have 3.5 GB, it is very similar to what memory rummaged between the processor and integrated graphics card (if you have a external video card, such a misunderstanding can be disabled in the BIOS).
3. The most unpleasant consequence of using the x86 OS is a limit on the amount of memory given to the individual application. In Windows it's only 2GB. Install at least 128GB of RAM, each application will receive no more than 2! But you can run 20 pieces at a time, and swap will not be!
4. And under x64 applications run a little faster.
Jeff28 answered on June 3rd 19 at 19:32
It's a marketing limitation for the desktop version of Windows. Server 32-bit Windows can address up to 32GB of RAM