<< Hope this helps. cat5 and cat5e are the same in terms of throughput. the only difference of "e" is that it is rated for ceiling installation. It has fireproofing. Cat6 allows for 1gb/sec. >>
I have to disagree. Category 5e will operate at up to 1000MHz (with additional hardware) instead of the 100MHz of standard CAT 5 cables. Gigabit Ethernet achieves 1000 Mbps by utilizing all 4 pairs of Category 5 cabling. In gigabit ethernet, each pair handles 250 Mbps using a simultaneous bi-directional transmission scheme (full duplex). The enhanced electrical performance of CAT 5e ensures that the cable will support applications that require additional bandwidth. For applications such as Gigabit ethernet or analog video over CAT 5E cables, you should certainly consider using CAT 5e over CAT 5 cable. All aspects of performance are enhanced: capacitance, frequency, resistance, attenuation, imedance, etc.
I think you are comparing plenum vs. non-plenum.