On catalyst6509 the supervisor will be installed on modules 5 and 6, the fan tray your need is WS-C6K-9SLT-FAN2. As far as the IOS it depends on the feature you are looking for. For my case I do use the sup720 as my core and the IOS I use is s72033-ipservices_wan-mz.122-18.SXF6.bin, just make sure the IOS you use starts with s72033-. You probably are going to need a flash because the image may not fit on your bootdisk. My image is almost 80M. Hope that helps.
"and do i need a DFC3B card to get full performance of X6724SFP module? "
The sup720 is rated at 30 Mpps (about 20 Gbps with 64 bytes packets) for the entire chassis for fabric connected cards. The cef720 DFC provides 48 Mpps for the line card. So for only a single X6724SFP with a couple of legacy Ethernet line cards, you'll probably be alright but if you start to add more gig (or 10 gig), you might then want to consider using the DFCs.
No you do not need E chassis specifically for sup 720. In the case of E-series chassis no fan upgrade is required. E-Chassis Fan tray is sufficient. In the case of non E-series chassis you need to have high speed fan tray.
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