Intel Core i9 7900X Skylake-X & Core i7 7740X Kaby Lake-X review: rushed release raises the bar

Intel reinforces lead and introduces most unnecessary CPU ever


Benchmarks: 3D-rendering (Cinebench / Blender)

In order to measure the performance of 3D-rendering we use the officially supplied benchmarks of the open-source Blender 3D-rendering software. We also run the well-known Cinebench 15 benchmarks, both multi-threaded as well as single-threaded. Both Blender and Cinebench are known for the optimal scaling of workloads with processors that have multiple cores.

With Cinebench 15 we calculate the multi-core scaling as well. This is the multi-threaded score, divided by the single-threaded score, divided by the amount of processor cores. With optimal scaling the multi-threaded scores would be exactly the same as the amount of scores times the single-threaded score, otherwise known as 100% scaling. However, in practice this scaling is slightly lower. HyperThreading / SMT makes it so that every core can process instructions of two program threads at the same time, which means that the scaling can be over 100%.

In Blender and the multi-threaded variant of Cinebench 15 the Core i9 7900X convincingly takes the lead. With 2189 points in Cinebench, Intel’s latest top model is 17% faster than the i7 6950X and 34% faster than the current Ryzen-flagship. In the single-threaded version of Cinebench the i9 7900X shows solid improvement compared to the last generation: TurboBoost 3.0 helps matching the score of the 7700K.

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