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Performance in programs

 Cinebench R15

Cinebench R15 is based on the Cinema 4D software. It is very useful to measure the performance gain obtained by the presence of several processing cores while rendering heavy 3D images. Rendering is an area where a bigger number of cores helps a lot, because usually this kind of software recognize several processors (Cinebench R15, for example, can use up to 256 processing cores).

We ran the CPU benchmark, which renders a complex image using all the processing cores (real and virtual) to speed up the process. The result is given as a score.

Disabling SMT on a Ryzen 7 CPU

On Cinebench R15 CPU benchmark, as expected, the system was 28% slower without SMT.

CPU-Z

On its current version, the well-known hardware identification software CPU-Z comes with a benchmarking tool, which measures CPU performance for one core and for all available cores.

Disabling SMT on a Ryzen 7 CPU

On the single thread benchmark, the Ryzen 7 1700X performed similarly with and without SMT.

Disabling SMT on a Ryzen 7 CPU

On the multiple thread benchmark, the CPU was 19% faster with SMT disabled.

DivX

We used the DivX converter, a tool included in the DivX package, in order to measure the encoding performance using this codec. The DivX codec is capable of recognizing and using all available cores and the SSE4 instruction set.

We converted a Full HD, six-minute long .mov video file into an .avi file, using the “HD 1080p” output profile. The results below are given in seconds, so the lower the better.

Disabling SMT on a Ryzen 7 CPU

On DivX encoding, the CPU ran 6% faster with the SMT disabled.

Media Espresso

Media Espresso is a video conversion program that uses the graphics processing unit of the video engine to speed up the conversion process. We converted a 1 GiB, 1920x1080i, 23,738 kbps, .mov video file to a smaller 320×200, H.264, .MP4 file for viewing on a smartphone. The results below are given in seconds, so the lower the better.

Disabling SMT on a Ryzen 7 CPU

Here the Ryzen 7 1700X was 7% faster with SMT off.

 WinRAR

Another task where the CPU is very demanded is on file compacting. We ran a test compacting a folder with 8 GiB on 6.813 files to a file, using WinRAR 4.2. The graph below shows the time taken on each test.

Disabling SMT on a Ryzen 7 CPU

On WinRAR, the CPU took 8% more time with SMT disabled.

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