HiPlease have a look at attchment. I have 4GB installed on vista 64 bit, why is physical memory says 51 % but free ram says 14MB only? why this difference?krishan

The amount under Cached (looks like around 2 GB in your picture) isn't counted as "allocated" memory as the OS will drop cached pages to free up memory when needed for other purposes (Vista does a lot more "smart caching" than XP did, and attempts to make your memory work for you as much as possible :-> ).Tim

This is good article explaining how Vista allocates memory: http://www.codinghorror.com/blog/archives/000688.html.Vista uses memory very differently to WinXP and is much more efficient.RegardsPeterH

Ok, I will have a read, what does the 14MB free mean? that's what concerns me.Its ok, having read it!!! I understand, thanks very much for the post.cheerskrishan