Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Possible Duplicate:
How to tell if a computer has a 64-bit CPU or OS

I want to know that my computer is 64-bit or 32-bit.

  1. What’s the different between 64 & 32 bit?
  2. How I can check out whether I have 64-bit or 32-bit computer?
  3. I want to install Suse 11.3 (64bit). Is it possible?
share|improve this question

marked as duplicate by Moab, studiohack Feb 17 '11 at 20:27

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

At a simple level: Do you have >4GB RAM? If so, you're 64bit, if not, you're probably 64bit but you only need a 32bit OS. – Phoshi Feb 17 '11 at 20:17
My RAM is 512MB! – Melik4 Feb 17 '11 at 20:19
What OS are you running at the moment? – Windos Feb 17 '11 at 20:21
Possible… – Moab Feb 17 '11 at 20:22
@Josh King:Windows XP (Service pack 3) – Melik4 Feb 17 '11 at 20:33
up vote 1 down vote accepted

Get SecurAble from this site.

It will tell you if your processor supports 64-bit or 32-bit as in these screenshots:





It's an old tool, but a good one for the job.

To answer your other questions:

  1. What is the difference between 64-bit and 32-bit Operating systems?

  2. See above.

  3. If you have a 64-bit processor then yes, otherwise no.

share|improve this answer
Err... DEP is available in 32-Bit, isn't it? I've got a Vista HP-32Bit (OS+Hardware), and it apparently supports Hardware accelerated DEP (or something similar). – Mateen Ulhaq Feb 17 '11 at 20:39

Usually there is a sticker on the machine if it's 64 bit. If you don't have that it appears to be very hard to tell. Looking on the web it seems like you can only tell if the OS you're running is 32 or 64 bit.

One of the easiest ways to tell would be to try installing a 64 bit OS. If you have 32 it won't install, if you try it the other way, a 32 bit OS will install on the 64 bit processor just fine.

Another way to tell is if you have stickers on the pc that tell you what kind of processor you have and do a search at the manufacturers website to see if they only made that processor in 32 or 64 bit.

The main difference between the two for end users is that you can access more RAM from the 64 bit machine; you'll usually only get around 3.15GB of RAM usable even if you have more than that installed. The 64 bit is only limited on desktops by the number of slots you have for RAM and the amount of RAM that will fit on each chip that the MB can handle.

I hope this help answer your question.

Addendum - after posting I saw that others had asked questions and your answer of 512M of RAM tells me you almost certainly have a 32 bit machine.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.