Sorry to clarify a bit more.   You only need 2x GbE NICs per server, running 4x NICs for iSCSI isn't going to be faster.  iSCSI will very rarely max out MB/sec.  It's more about how fast I/O can be processed, the IO per sec rate. 
Hi, Our systems were designed and built by a dell partner but I've been unable to find articles online that backup their design. 6xR810 with 8 network ports 2xPC6248 switches EQL PS6500X fully populated 8 network ports connected (4 active) The R610 servers are running 2012 R2 and have two teams configured using inbuilt teaming with 4 nics assigned to each team.  -  'Team 1' which has all the virtual NICs connected and is using LACP. -  'iSCSI Team' set to switch Independent. When I look at the adaptor usage it looks like only 1 of the 4 NICs is taking all the traffic with the rest practically idle.  I know that as of 2012 R2 teaming is supported for iSCSI but is this configuration correct in this case? Thanks
Team connection to EQL