I have WS-C4507R with WS-X4515 Supervisor, and WS-C4507R with WS-X45-SUP6-E Supervisor. Same network topology, same traffic rates, same IOS version: Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-ENTSERVICESK9-M), Version 12.2(53)SG3, ...