Hi, Assembled my new system with: AMD Phenom II X4 940 Gigabyte GA MA790GP - UD4H Corsair 800Mhz 2GBx2 RAM Modules My system is showing only 2.75 gb of RAM. I understand that OS being 32bit the RAM showed is less than 4 GB. But my office PC (HP System - using E7400+4gb RAM) shows 3.31 GB of RAM. I cant understand why there is such difference of RAM Capacity? Does it depends on the Processor and MObO used? Also, if i install 64bit XP then do I've to install all my softwares again i mean will the current softwares which run on this 32bit sys will work on the 64bit machine?