64bit gives you more headroom than you need with memory. The key difference in 32bit v 64bit with respect to memory is how much memory a individual process can take. So MySQL, Tomcat(java), etc in a 64bit env can use more than 3GB each. So moving to 64bit will let you cache more data in memory which will give you a nice performance boost on a busy system assuming you add more RAM. Having more than 4GB of RAM on a 32bit system usually doesn't help too much other than file system caches. |