Intel Core i9-7900X And Core i7-7740X CPU Review: Skylake-X and Kaby Lake-X Debut

Core i9-7900X And Core i7-7740X - JetStream And LAME MT Tests

Next up, we have some numbers from the JetStream Benchmark Suite developed by WebKit. The JetStream Benchmark Suite uses a wide array of latency and throughput benchmarks to evaluate JavaScript performance, and all of the results are tabulated with roughly equal weighting. The benchmark measures both metrics of traditional JavaScript programming styles used on websites as well as new JavaScript-based technologies used on more modern, rich web applications. Scores in this benchmark are an indicator of the performance users would see when browsing and running advanced web applications.
JetStream JavaScript Benchmark
JavsScript Performance Testing
All of the systems were tested using the latest version of Microsoft's Edge browser, with default browser settings, on a clean install of Windows 10 Professional x64.


This is a lightly-threaded benchmark that doesn't fully leverage all of the resources available in a many-core processor with SMT. As such, the Core i9-7900X doesn't quite take the top spot, which is reserved for the Kaby Lake X based Core i7-7740X, but it clearly beats all of the other many-core chips.

Audio Conversion and Encoding
In our custom LAME MT MP3 encoding test, we convert a large WAV file to the MP3 format, which is a popular, day-to-day use case for many end users, to provide portability and storage of their digital audio content. LAME is an open-source mid to high bit-rate and VBR (variable bit rate) MP3 audio encoder that is used widely around the world in a multitude of third party applications.

In this test, we created our own 223MB WAV file and converted it to the MP3 format using the multi-thread capable LAME MT application in single and multi-thread modes. Processing times are recorded below, listed in seconds. Shorter times equate to better performance.


The Core i9-7900X performed well here. Although only one or two cores are taxed, its relatively high clocks propel the processor new the top of the charts in the MT test. The single threaded result was just a notch behind the Core i7-7700K and Core i7-7740X, of which the latter took the pole position.

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