Originally Posted by Richard Dawkins

Obviously when you're running Windows under Parallels the Windows part won't have all available system resources. Most of the time that won't be an issue. But let's say you're wanting to play a game that is available in PC only, and needs a lot of "juice"... for moments like this, I have Windows running under both parallels and also available as an option to start with using Bootcamp. Harddrives are so big now that there's plenty of space to set things up this way. On my Mac I can start in a Windows OS and have all resources available. Macs make great Windows machines.