What you say does happen Snapper, but it's a case of overall RAM management, ie a matter of having enough RAM and a 64-bit OS to use it.
If the sim doesn't use more than 3 GB for example (the entire game folder is about 4 gigs), having a 64-bit executable for the sim won't matter much. What matters is having more than that and an OS that can "see" it so you can give CoD the assumed 3GB it needs and have enough left to run whatever else you need to run in the background
