The first part made sense about crosstalk, but then the reasoning (RAID, SCSI etc throughput) made no sense at all. Crosstalk is a problem where you've got a load of cables running in parallel (i.e. a cable duct). That's why data centres use CAT6 (and sometimes 7) in their ducting.id10T_error said:CAT6 Has better earthing/shielding (ie separator) CAT5/5E which is important to prevent crosstalk which is a big issue when using Gigabit on a fast setup (10/15k Drives and RAID-setups)
Just having a couple cables running parallel for your home network is fine. You need hundreds before crosstalk becomes a problem...
Cat5e is all a home needs.
The "13% utilisation" problem somebody mentioned about GigE is probably because they were using PCI GigE cards purchased for £20.