Windows XP, Vista and Seven exist in two versions: 32-bit (x86) and 64-bit (x64) versions.

32-bit versions are most common but don’t allow you to use more than 3.25 GB of RAM (there are some tricks you can use but don’t always allow you to extend this).

No problem however for the 64-bit editions which allow you to use several tens of GBs of RAM in normal conditions.

Many computers however come with 4 GB of RAM installed (2x2 GB). It is frustrating not to be able use all of your RAM. Does this mean you should go for a 64-bit version of Windows?

A lot of people are wondering what to do, nervous as they are about software compatibility and even dips in performance linked to a lack of optimisation.

Analysis of results

As you can see on our different graphs, the 64-bit version doesn’t cause any dip in performance. Better still, in most cases, it gives a gain of few seconds in encoding time.

In gaming, this seems to vary from one game to another. There’s no clear winner. This is due in particular to more rigorous support for graphics drivers: both ATI and NVIDIA systematically release drivers for both systems.

Our advice

If you have 4 GB of memory (or more of course), we advise you to move straight up to the 64-bit version of Windows 7. No need to do this however if you have 3 GB or less of RAM. In that case, stick with the 32-bit version.

What about software compatibility? If your machine is for purely personal use, there won’t be any problem as the 64-bit versions of Windows 7 handle 32-bit application support very well.

For those looking to use specific apps: find out first. Ask the software publisher if a 64-bit machine will pose any problem.