Nope - the Mac is driving this bus, not the RAM.
You know all those ads that a certain EBay seller puts on Mac RAM - Hyperformance, Optimum speed, Fastest possible RAM for your Mac?
All Bunkum. If the RAM is compatible with the machine, it runs at precisely the same speed as all other RAM that is compatible with the machine.
Thanks
Trevor
CanadaRAM.com
Edit - beaten to the post by the Yipster 😉