In theory yes, in practice the actual impact is minimal in *most* situations. Like I said, check the real-world benchmarks. There are some very specific situations where a larger (but still not huge) difference can be seen, in fact years ago in previous versions of Terragen (Classic, I think), before multithreading, we saw some performance differences that seemed attributable to cache sizes. But these days additional cores are almost always going to give you better performance (unless they're at a much lower clock speed than the lower-core-count CPU).
- Oshyan