We have 2 6513's with SUP 720 modules running IOS 12.2(17a)SX4.
We insert the 6608-T1 module in slot 4 and get the following message:
4w5d: %C6KPWR-SP-4-UNSUPPORTED: unsupported module in slot 4, power not allowed: Unknown Card Type.
Sounds like we need some sort of IOS upgrade but I haven't been able to find a requirements document on the 6608.