Cat6 CCA or Cat5e Pure Copper

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http://serverfault.com – I'm trying to decide what wire we should use when running new runs. I was wondering what implications there might be to using CAT6 Copper Clad Aluminum wiring vs Pure Copper CAT5e. I'm not sure if I could expect benefits from one over the other given the relatively short runs that I expect to have (10-100ft, or 3-30 meters). The only plans I currently have for the wire are for ethernet use. EDIT: I don't have any specific speed target other then to get as fast as I can with the given cable. My question spawned from reading a couple of things online stating that there can be heat issues f (HowTos)