Gavin
From Sup32 Q&A
Is there any system requirement to deploy Sup32?
A. Sup32 requires the high-speed fan tray when operating in the Cisco Catalyst 6500 Chassis. As such, a minimum of 2500W AC (in either 110V or 220V mode) or DC power supply is required for operation in a 6-, 9-, and 13-slot chassis. It requires a minimum of 950W in the 3-slot chassis.
Sup32 can also operate in the E-Series chassis or a Cisco 7600 Series Router.
For power supply chassis support please see this link - 3rd question down.
http://www.cisco.com/en/US/prod/collateral/modules/ps7189/ps7195/prod_qas0900aecd805a4acb_ps708_Products_Q_and_A_Item.html
Jon