Hmmm... from the guide to a Sup6T. This sort of implies CFC-enabled cards might be out of luck as well.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6807xl/hardware/installation/guide/b_c6807xl_hig/b_c6807xl_hig_chapter_01010.html
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Feature
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Description
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Chassis compatibility
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Supported on all Catalyst 6500 E-series chassis and Catalyst 6807-XL chassis.
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Software requirements (minimum)
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Cisco IOS® Software Release 15.3(1)SY and future releases.
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Slot installation restrictions
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Supervisor Engine 6T must be installed in slot 3 or slot 4. The primary supervisor engine can be installed in either slot.
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When the Supervisor Engine 6T is installed in a chassis with any supported module, there is a requirement that the two slots adjacent to the supervisor engine and the module either have a module installed in them or, if the slots are unused, have a switching-module filler plate (Cisco part number SLOTBLANK-09 or C6800-XL-CVR-E) installed for NEBS compliance. Do not use blank slot covers (C6800-XL-CVR) to cover the adjacent unused slots.
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Hardware restrictions
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Supports only modules equipped with the DFC4-A, DFC4-AXL, DFC4-E, or DFC4-EXL daughter cards. Modules equipped with DFC3 or CFC daughter cards are not supported. For further information on hardware restrictions and module support, refer to the software release notes at the following URL:http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-3SY/release_notes/release_notes.html
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