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.
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.
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.
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.