Rendering Performance – Ryzen 9 7900
We will now take a look at how rendering performance compares.
In Cinebench R23 we are pushing all the cores as fast as possible, and when added up, with the lower clock speeds on Ryzen 9 7900, it does perform 18% slower than the Ryzen 9 7900X. That is a pretty significant difference, considering they have the same core and thread count. PBO brings back a lot of that performance though, and brings performance right at Ryzen 9 7900X performance. It adds 20% more performance.
While multi-core is slower, in single-core performance the Ryzen 9 7900 isn’t that much slower. The Ryzen 9 7900 is only 3% slower than the Ryzen 9 7900X, and PBO doesn’t help a lot, but a little.
Blender Open Data Benchmark
Take note, the Blender Open Data Benchmark has changed, it now runs 3 scenes and spits out a “Samples per Minute” number, where higher samples are better.
Blender puts all the cores to work, and just like Cinebench we see that the Ryzen 9 7900 is noticeably slower than the Ryzen 9 7900X, despite the same core count. Here we see that the Ryzen 9 7900 is 16% slower than the Ryzen 9 7900X. However, enabling PBO increases performance to nearly Ryzen 9 7900X performance, you get 17% more performance.
We see the same result in the junskshop scene. The Ryzen 9 7900 is 15% slower than the Ryzen 9 7900X and adding PBO increases performance by 15%.
In the classroom scene, the Ryzen 9 7900 is 18% slower than the Ryzen 9 7900X and PBO adds 20% more performance.
V-RAY 5 Benchmark
In V-Ray 5 the Ryzen 9 7900 is 18% slower than the Ryzen 9 7900X. Turning on PBO increases performance to nearly Ryzen 9 7900X performance, increasing performance 20%.
We are going to test HandBrake performance encoding a 10-minute video using two different media formats, H.264 and AV1 on the CPU only. Remember, we are looking for the lowest time to encode here, the lowest result is the better one.
In this first test, we are rendering using the Creator preset at 2160p60 4K H.264 preset on a 10-minute video which was recorded at 1440p, therefore it is upscaling the video. Our test shows that the Ryzen 9 7900X does the encoding in less time, which is faster at 11.36 minutes/seconds. The Ryzen 9 7900 is slower, and adds three more minutes to the render, taking 14 minutes. However, turning on PBO does help a lot and reduces render time down to the Ryzen 9 7900X levels.
In this test, we are testing the new AV1 codec in the Fast 2160p60 4K AV1 preset, which is upscaling the video to 4K. As the time to render is longer, the difference widens between the CPUs. We see that on Ryzen 9 7900X it takes 38 minutes, but it takes 44 minutes on Ryzen 9 7900, an increase of 6 minutes. For long renders, this time adds up. However, once again, turning on PBO brings performance right up to the Ryzen 9 7900X.