How Much Virtual Memory Do I Need?

No one can tell you how much hard disk space you need to allocate to a permanent paging file because every system is different and everyone uses his/her system differently.

If you create a permanent paging file that is too small, then Windows will continuously create more virtual memory via a dynamic extension to the permanent paging file. This reduces the paging file's performance

If you create a permanent paging file that is too large, you are only wasting hard disk space, especially on the outer tracks.

So, the best method would be to accurately gauge how much virtual memory you actually need. This allows you to create a permanent paging file with the appropriate size. To do that, you need to monitor your paging file usage. Let's see how you can do that.

Finding Out In Windows 9x

Give your system a clean boot and once you are in Windows 95/98, load System Monitor. You can get to it via Start Menu > Programs > Accessories > System Tools. You will see this screen :-

Go to the Edit menu and click on Add Item...

In the next screen, select the Memory Manager category and add Swapfile in use. Click OK and you will see this screen :-

Now, you can monitor the size of your paging file. Start up and run all the applications that you usually use at the same time. Load several documents and work files. Play around with them and check the peak value for the paging file.

Then play several of the most memory-intensive games you have. 3D games with large textures are good ones to test. At all times, record down the highest value for the paging file size that System Monitor reports.

Once you are done, select the highest value that has been recorded for the paging file size and round it up to the nearest 100MB. For example, if the biggest size your paging file ever went during the tests was 619MB, then 700MB is the ideal size for your paging file.

But always make sure you add at least 40-50MB as a cushion against future memory-guzzling applications or games. For example, if the largest size your paging file expanded to during your tests was 684MB, then 750MB would be an ideal size for your paging file.