The 6509 is end of sale:
It could only support a maximum of a 4000W power supply.
The 6509E supports in excess of 6000W power supplies.
It also supports the newer technology such as the Sup 2T and the ASA blades.
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As Sean has noted, one of the features that -E chassis supports is newer technology blades, i.e. the -E supports up to 80 Gbps per slot, including all the slots of a 6513-E.
In Addition to the Switching Capacity and BW per Slot, Power Supply, Note, You Cant run the VSS Feature on the Normal 6000 Series Chasis. You should have the E Series of the Catalyst 6000 Chasis.