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Javascript performance
The usefulness of Javascript benchmarks for comparing browser performance may be on the wane, but these collections of tests are still a fine way of demonstrating the real-world single-threaded performance differences among CPUs. These tests may be an ideal stage for Skylake-X's improved Turbo Boost Max 3.0 implementation.

Turbo Boost Max 3.0 doesn't go all the way toward eliminating the single-threaded performance gap we tend to see between mainstream and high-end Intel chips using the same architecture, but the feature does let the i9-7900X get most of the way there—and in Kraken, the Skylake-X chip does catch the i7-7700K. That's good news for folks who like a responsive machine in both lightly-threaded and all-out workloads.

Compiling code in GCC
Our resident code monkey, Bruno Ferreira, helped us put together this code-compiling test. Qtbench records the time needed to compile the Qt SDK using the GCC compilers. The number of jobs dispatched by the Qtbench script is configurable, and we set the number of threads to match the hardware thread count for each CPU.

Bang. The i9-7900X neatly shaves 20% off the compile time of our previous champion, the Core i7-6950X, and it does it for hundreds of dollars less.

7-Zip file compression

Put the i9-7900X to work zipping and unzipping archives, and it delivers a small-to-moderate boost over its Broadwell predecessor. Memory speeds don't seem to make the least bit of difference to the 7900X's performance, though.

VeraCrypt disk encryption
VeraCrypt is a continuation of the handy TrueCrypt project. This disk-encryption utility lets us test throughput for both the hardware-accelerated AES algorithm and the implemented-in-software Twofish cipher.

The AES half of our VeraCrypt testing does appear to be memory-bound for once, so DDR4-3200 allows for a whopping 2.4 GB/s higher throughput. Twofish doesn't enjoy any such speedup from faster memory, although the i9-7900X still handily pulls away from the i7-6950X.