We have the 6148-GE-TX cards in our 6513 and a recent conversation with a Cisco tech made me learn that these cards are oversubscription linecards. Buffers are shared among 8 ports and it is recommended to spread high end servers out and try to keep them off the same buffer. Does anyone have any insight on this? Should I follow these guidelines of not having high end servers sitting next to each other on the switch? What about flow control? Should I set this to send on and receive on, after making sure the server side setting is that same as well?