A 32-bit system can access 232 different memory addresses, i.e 4 GB of RAM or physical memory ideally, it can access more than 4 GB of RAM also. A 64-bit system can access 264 different memory addresses, i.e actually 18-Quintillion bytes of RAM.32-bit operating systems and 32-bit apps require less memory and storage than their 64-bit versions. This could make a different to the performance when the memory is only 2GB. Running short of RAM causes increased disk activity, which slows down the PC.As its name suggests, the 32 bit OS can store and handle lesser data than the 64 bit OS. More specifically, it addresses a maximum of 4,294,967,296 bytes (4 GB) of RAM. The 64 bit OS, on the other hand, can handle more data than the 32 bit OS.

Can 32-bit CPU use more than 4GB RAM : 32-bit architectures are not limited to 4GB of physical RAM. The limitation is 32-bits (or 4GB) of VIRTUAL address space in a single process. It is quite possible for a 32-bit processor and operating system to support more than 4GB of PHYSICAL memory.

Is 32-bit good for low end PC

64-bit programs require more memory to run than their 32-bit versions. So on older 64 bit machines, with less RAM onboard – it makes more sense to run a 32 bit OS. That situation can easily be mitigated by installing more RAM. But if you don't have that luxury – then sticking with a 32 bit OS is your best recourse.

Why is 32-bit only 4GB RAM : By definition, a 32-bit processor uses 32 bits to refer to the location of each byte of memory. 2^32 = 4.2 billion, which means a memory address that's 32 bits long can only refer to 4.2 billion unique locations (i.e. 4 GB). In the 32-bit Windows world, each application has its own “virtual” 4GB memory space.

As you can see, 2GB is the minimum RAM for a 64-bit installation. So the short answer is yes, you can run it.

32-bit operating systems cannot address more than 4GB of RAM unless they have a feature like “Physical Address Extension” in Windows that allows the system to address a larger amount of RAM. A 32-bit OS without such a kludge will support 4GB at a maximum.

Will 32bit run faster on 64-bit

32-bit applications optimized for a 32-bit system won't gain any advantage from running on 64-bit hardware. To the contrary, penalties from emulation and compatibility issues described above may apply. However, non-optimized applications may gain some performance from running on 64-bit machines.32-bit operating systems cannot address more than 4GB of RAM unless they have a feature like “Physical Address Extension” in Windows that allows the system to address a larger amount of RAM. A 32-bit OS without such a kludge will support 4GB at a maximum.4GB

Memory in 32 and 64-Bit Architectures

In terms of Random Access Memory, 32-bit architectures can address 4GB of memory, maximum. A 64-bit architecture, in turn, has a theoretical limit of addressing 16 million TB of memory.

64-bit is mostly faster than 32-bit (sometimes considerably so). Some benchmarks here and here. There are some exceptions, but they tend to be rare. But code size and data size (if it includes pointers, or types that vary with 32-bit/64-bit) may be larger and that can affect caches.

Is 32-bit good for gaming : Short answer is if you're using more than 4GB of RAM you'll need a 64bit version to see it and utilize it. In general, for gaming, having more RAM is a good thing. Getting a 32bit OS will limit you for that type of use. Especially as time goes on, game requirements increase, etc so again, 64 should be the way to go.

Is 4GB RAM only 3gb usable : This is a known limitation. All 32-bit client versions of Windows (not just Vista/XP/7) have a 4 GB addressable space (64-bit versions can use much more). However you can't use the entire 4 GB of addressable space. Even though you have a 4 GB address space, you can only use around 3.1 GB of RAM.

Which is better for 2GB RAM, 32-bit or 64-bit

2GB represents the minimum for 64bit so with 32bit you are at least above that minimum. One major benefit of 64bit is the ability to address above 4GB (32bit is limited to around 3.2GB) so if you don't have that much that rules out one reason why you would look to change.

First of all,2 GB RAM is too low considering today's software. They require good amounts of RAM to run smoothly. If you are using windows 10 then it alone uses a huge amount of RAM for its background processes. I suggest you to immediately upgrade your RAM to at least 4 GB.8GB of RAM is the amount of memory we recommend for casual computer users. If your usage includes internet browsing, email, lots of office programs, flash games, and multitasking – this level of memory should be sufficient.

Is 32-bit faster than 64 for old PC : 64-bit is mostly faster than 32-bit (sometimes considerably so). Some benchmarks here and here. There are some exceptions, but they tend to be rare. But code size and data size (if it includes pointers, or types that vary with 32-bit/64-bit) may be larger and that can affect caches.