I know it's a long shot, but curious if anyone is using a cpu renderer on the 28 core and how it performs?
Should the 28 core scale linearly in terms of render times?
Currently using the 16 core and was thinking of upgrading the cpu.
Simple rule of thumb : find base clock (or all core boost of the processor - NOT top speed which is usually one/two cores max ) and multiply that by number of cores. Add 10% to the result (hyper/multi threading) and you get a sense of how fast your processor will render vs the comparison.
It by no means an accurate calculation, other factors may come into play, but generally it gives you something to gauge before deciding to investigate further.
Ideally you want to compare processors a generation or two between them and/or price to performance ratio per core.
Arnold does scale really well and makes good use of the cores you throw at it.