Hi Alfizqui, Thanks for posting on Dell TechCenter.  Yes you are correct, the midplane is hardware that is part of the M1000e chassis.  Here's a clarification on your question from Dell Product group (I also work for Dell). "The current midplane you have will work great.  The error message is basically there to tell you that Fabric A, your on-board NICS or Select Network Adaptor, could run at 10Gb Ethernet if you have the 1.1 midplane.  But you can still run at 1Gb like on the 1.0 midplane. The 1.1 midplane did upgrade Fabric A to speeds higher than 1Gb.  That was the major revision to that midplane but newer blades work great on the older midplane. You can also upgrade your midplane if you choose via a Dell customer kit.  Obviously it’s a pretty big change so usually Dell just recommends getting a new chassis as likely you’re getting new servers and switches (10GbE instead of 1GbE) anyway and then using the older chassis for the previous servers."
I recently added a few M620's to a few of my chassis that previously only had m710HD's one of my chassis gave this error in the CMC on this server  " Component performance can improve if it is installed in another chassis that has a newer midplane, or if the current chassis is upgraded; the current chassis has midplane version 1.0. " My only question is the Midplane version a hardware piece or software version?  Thanks.
M1000e Midplane error on M620.