It can work at 1Gbps on them if they do not have 10Gb nics.
Good day everyone. We currently have and md1200 connected to a MD3220i. The problem is the MD3220i warranty expires this year and dell does not allow to buy more warranty for this unit,  the warranty for the md1200 unit will expire on 2020.  Both units are currently used for vmware iscsi storage in production enviroment, it is possible to connect the MD1200 to a brand new MD array or what would be the recommendation for our case. Thanks in advance.  
Connect MD1200 to a new MD array.