The problem is that the silvers are a step down, not a perfect replacement.
https://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#"Skylake-SP"_(14_nm)_Scalable_Performance
Bronzes have no turbo boost, and the clock speeds on the silvers are lower than previous SKUs in Mac Pros.
There's some nice benefits, like 6 DIMMs, but it seems like too heavy a sacrifice for single-core tasks.
A step down from what? The Xeon E5-2630 v4 was a 10 core 2.2-3.0 GHz processor for $667. The silver 4114 is a 10 core 2.1 to 3.0 GHz for $690. Its pretty much the exact replacement (which to an extent is a disappointment from Intel, it would be nice if the 12 core, 4116 was at this price point). If you're comparing the low end multi socket capable Xeons to the E5-1600 (in the tcMP) or -W series (in the iMac Pro) in max single core clock speed, you're doing it wrong. You only get these processors if you need multicore performance above all else (edit: well, that's not the only reason, like ultra-high memory needs would be another, but you get it). If you want both > 12 cores (in single or duel processor packages) and high single core clock rates, you're going to have to back the truck up for it.
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