Comparing fields?

Question

Hi all I would like to know if it is possible to compare two fields on a form to determine which one is "greater"? I am writing an app that will scan the users system and display the proc speed, video card, memory, OS, etc. The user will be allowed to select a list of games to display that game's requirements. I would like a way of determine if say, the users' proc speed is less than that of the selected games' stated proc speed. So, for example if the users rig has an 2.2 Core 2 Duo and the selected game requires at least a 3.2 proc, how can I compare the two values? Thanks!