x265 Benchmark

Table of contents

Long time, no write

Sorry for the delay, but some things prioritized higher. But beside that, my RPis had some work to do.
The last weeks I benched GAT’s x265 Benchmark.1 It took me some time…

The x265 Benchmark

After the x264 Benchmark, GAT decided…or was forced…to make benchmark based on x265 in order to bench newer, more powerful systems and make the benchmark even comparable between Linux and Windows.
The current list of submissions can be found at GAT’s website.2

I used the x265 Benchmark to test some configurations of my Raspberry Pi 4 Model B with 8 GB RAM and try to look how much faster it is against a 4 GB GAT previously benched, since the x265 Benchmark is officially made for systems with 12+ GB RAM.
With less than 12 GB the system will be swapping data to the boot device.

4 GB vs. 8 GB

GAT’s Raspberry Pi 4 Model B with 4 GB did the benchmark in 147h 18m 56,61s.3 This will my baseline.
With my 8 GB model at a default clock speed of 1.5 GHz and using an microSDHC-card the benchmark took 116h 18m 56,67s4, which is about 21 % faster.

If you see this, the image is broken :(

SDHC vs. SSD

Since swapping to a SD-card is very slow, I tested a M.2 NVMe SSD on one of the two USB 3.0 ports, again at default clock speed of 1.5 GHz.
In 103h 00m 47,19s5 the benchmark was done about 11 % faster.

If you see this, the image is broken :(

1.5 GHz vs. 2.3 GHz

Since I like overclocking a bit, I wanted to see how good the benchmark sclaes with clock speeds.
With air-cooling and the current temperatures I was able to reach stable 2.3 GHz, which is about +53 % in clock speed.
With these +53 % the benchmark was done in 75h 30m 53,20s6, or about 27 % faster than stock clocks.

If you see this, the image is broken :(

Direct comparism

Model RAM Boot device Clock speed Time Change
Raspberry Pi 4 Model B 4 GB SDHC 1.500 MHz 147h 18m 56,61s 100 %
Raspberry Pi 4 Model B 8 GB SDHC 1.500 MHz 116h 18m 56,67s 121 % / 100 %
Raspberry Pi 4 Model B 8 GB SSD 1.500 MHz 103h 00m 47,19s 130 % / 111 % / 100 %
Raspberry Pi 4 Model B 8 GB SSD 2.300 MHz 75h 30m 53,20s 149 % / 135 % / 127 %

I’ll be back!

Due to the lack of a 16 GB model the journey for the RPi4B ends here.
Maybe in the future of a possible Rapsberry Pi 5 with 16 GB of RAM, I’ll do a comparison and run it all again, with hardware-specification above the minimum.


  1. x265 Benchmark (kein Schnelldurchgang! 64-Bit manycore und ≥12GB RAM) ↩︎

  2. www.xin.at/x265 ↩︎

  3. 147h 18m 56,61s ↩︎

  4. 116h 18m 56,67s ↩︎

  5. 103h 00m 47,19s ↩︎

  6. 75h 30m 53,20s ↩︎