I would at least get these if you wish to stop at 2666.
https://www.newegg.com/Product/Product.aspx?Item=N82E16820231890&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
To the best of my knowledge if your out of the RMA peroid and have a stick of Team memory go bad it has to be sent to Taiwan for warranty.