this post was submitted on 20 Nov 2023
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Blender seems like it should be pretty close to embarrassingly parallel. I wonder how much of the <100% scaling is due to clock speed, and how much is due to memory bandwidth limitation? 4 memory channels for 64 cores is twice as tight as even the 7950X.
Eyeballing the graphs, it looks like ~4 GHz vs ~4.6 GHz average, which...
Assuming a memory bound performance loss of
x, we can solvefor
x = 5.7%.