B365Mpro4 max supported speed is 2666. Unlike ryzen, Intel does not depend on ram speed for performance anyway.
Save your money.
You would want a Z based motherboard to allow ram overclocking.
Ram speeds past 2666 are achieved by overclocking better binned chips.
I might think 3600 speed and even that would not be a big deal.
Here is an older link on ddr4 ram speed scaling:
Armed with a massive 32GB high-end Kingston HyperX Predator DDR4-3000 memory kit, we investigate how DDR4 frequencies and latencies affect real world performance on Intel’s latest mainstream desktop platform. October 13, 2015 by Lawrence Lee Product Kingston HyperX Predator DDR4-3000 32GB...
silentpcreview.com
If your apps can use ram as workfile space, then there is a big advantage to more ram vs. faster ram.
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