Intel’s Core i3-8350K is the first i3 to offer four physical cores, and early results suggest that it could end up being a popular chip: even without overclocking, the 4GHz CPU scored 503.3 points in single-threaded performance (faster than both the Core i7-6700K and even the Core i7-7700K) and a more impressive 1,982 points in multi-threaded performance.
Clock for clock, it appears Intel made some decent improvements to IPC performance with Coffee Lake. This is what Intel has been promising. On the mobile side, Intel claims users will see “up to a 40 percent” uplift in benchmarks like SYUSmark and MobileMark, compared to 7th generation Kaby Lake processors. And on the desktop front, Intel previously said its flagship Core i7-8700K will offer an 11 percent performance gain over the current Core i7-7700K, with multi-threaded performance jumping a little over 51 percent (due to a higher core/thread count).
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Source: [H]ardOCP – Leaked Intel Core i3-8350k Benchmarks Suggest Strong Multi-Threaded Performance