Running @aras's current C++ ToyPathTracer on my tablet (6650U/Iris540 = 23/80 Mr/s) & desktop (2500K/1070 = 30/465 Mr/s) is going on the list of why I should grab a new Ryzen later in the week.
Sanity check: the 1070 score almost perfectly predicts boost GFLOPS vs http://aras-p.info/blog/2018/04/16/Daily-Pathtracer-10-Update-CsharpGPU/; my Iris seems to be slightly ahead (maybe as it was before thermal throttle kicked in).
I grabbed a Ryzen 2700X today and before any tuning/OC, I'm now getting 132 Mr/s with this CPU code (same build). It's no Threadripper but that's certainly a step up (for embarrassingly parallel workloads).
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