64-bit processers are used a lot in CAD projuect, so should be able to process the massive amount of data in FM very well, but as has been mentioned in previous post, if your looking to buy a laptop maily for FM then take more notice of the ram it has (if you go to a store, you can negotiate with the sales people to get more if you are confident). so id look for something with at least 1 gig of ram for fm, and then look for a processer which will meet your other computing needs | 
