it makes sense, RAM must be in the right channels
i still doubt your CPU is unlocked
i run my E5-2680v3 2,5ghz 12 cores to 14520 geekbench score, no turbo
your 15284 is a natura/normal score for a E5-2680v4 2,4ghz 14 cores, i suppose you can go higher, i will send the bios tuning soon
on my case i get an 12% improvement, from 12940 (last share result at post #101) to 14250, just by changon some config on bios
Benchmark results for a MacPro7,1 with an Intel Xeon E5-2680 v3 processor.
browser.geekbench.com