Channel count doesn't dictate speed rating. Dual and triple channel kits get the same rating as a single stick. And any speed above default is an overclock. That said, high speed memory is pretty common and relatively easy to set via XMP (intel) or DOCP (amd). It's not guaranteed though so you may find your combination of hardware can only run a 3600 kit at 3200 stable. You just have to try it.
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