Earlier Ashwin wrote about How to identify the type of RAM your computer has? now here is another tool which wil give you a lot of information about your RAM.
I have two 2GB RAM and see the details of them displayed.
So RAMMon can give you all most all details about your RAM. The details includes
Maximum Clock speed of your RAM
Maximum transfer speed
Bus width in Bits
Write recovery time
You can also search Amazon for your RAM using the link displayed.
RAMMon is free for Personal use. For commercial use it will cost $15 per license. The application have both 32bit and 64 bit versions.
Windows XP, 2003 Server, 2008 Server, Vista, Windows 7 and Windows 8.
32 MB RAM, 2 MB of disk space
Read more about the product here