We have a couple of HP Proliants DL380 G6 (windows 2008 SP2) that have teamed network connections to an Cisco 3750e and 3560e network switch - this two switches are tied to a 6513. When we do a file copy between two servers (connected to 3750/3650 switches - on NIC in each switch Teamed) we are getting about 4-4.3 MB/sec data transfer speed. But if we go and transfer data to a server that is attached to our 6509 (core switch) we are getting 65/75 MB data transfer. But coming back the other way we still are getting 4.50 MB data transfer speed. I am not a networking person but trying to find out why the difference. The 3560e and 3750e are attached to the 6513 by 10Gig Ethernet.