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There is a lot of confusion among the networkers what is the main difference between Cat 5 E and Cat 6 cables.
Cat5e cable run near gigabit speed (With any above normal noise or substandard equipment you can see performance drop), it just cannot be "certified" for this use. Howevre Cat 6 cable is designed especially for gigabit use, and is certified to operate at said speed despite of some noise and abnormalities.
Main difference between Cat 5e and Cat 6 cable is transmission performance and available bandwidth as Cat 5 support 100 MHZ and Cat 6 Support 200 MHZ
These will provide better signal-to-noise ratio, allowing higher reliability for current applications and higher data rates for bandwidth intensive applications.
When implementing Cat 6 make sure you are using appropriate connectors to achieve best performance.
I have learnt from difference resources there is not standard for Cat6 cabling however there is approved standard for Cat 6 cabling which is ANSI/TIA-568-B.2-1
There is one new standard for Cat 6A which will support 10 Gbps and can support up to 500 MHZ.