Sup2 question and IOS on Sup1A

I am in the market for a 6506 with Sup2 engine. I have noticed two differenet part numbers/models:


Does anyone know the diff between Sup2 and Sup2U?

I was also looking at Sup1A. The unit probably wont push more then

200-300Mbit, so I figure a Sup1A might be okay. But a vendor warned me that it wouldn't be wise to run the latest 12.2 IOS on a Sup1A, is there any basis to that?


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from Cisco site:

WS-X6K-S2-MSFC2 Cisco Catalyst 6500 Supervisor Engine 2, 2GE, plus MSFC-2/PFC-2

WS-X6K-S2U-MSFC2 Cisco Catalyst 6500 Supervisor Engine2, 2GE, plus MSFC-2/PFC-2 with 512MB for MSFC-2

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