2666mhz is the max memory speed officially supported by intel, anything over 2666mhz is technically considered overclocking. That said if the motherboard supports 3600mhz RAM and that kit is on your mobo's compatibility list it should run at 3600mhz without issue.
However RAM kit's that fast may take some manual tweaking in order to boot and run stable at 3600mhz. If you are expecting to just turn on the XMP profile and have the RAM run at it's advertised speeds I would recommend a good 3200mhz kit.