HWDB's TaPaKaH is well-known for his insights and knowledge of memory overclocking. Last weekend he looked into a 16GB DDR4-2400 Patriot kit which turned out to be not so forgiving for overclocking (see quote below).
"Getting our test sample to run DDR4-2800 was extremely easy, it could even lower the timings to 12-14-14 given enough voltage. However, DDR4-3000 and anything above was mission impossible. Irrespective of the timings, subtimings, voltages and platform-related settings, we would occasionally have Memtest errors around the 70% mark, which would cross the DDR4-3000 mode out as potentially unreliable. This makes Patriot kits two for two on unexplained overclockability issues, so there is clearly something wrong with chip binning within the company."