Render Speeds and Resolution

Hi Everyone!

I was rendering out a model I made today, and the issue of render time vs quality came up. As I wanted this to look its absolute best, I went for 2048 samples, and a slight denoiser.

As it rendered and I noticed that I was still getting a lot of noise, I started thinking: will the noise go down noticeably if I increased my resolution?

So I did a crazy test.

Below, you’ll find my Cycles render of a Vape Juice bottle, at 2048 samples with .10 strength denoising, in HD (1920*1080). Render took 28 minutes.

And here, is my Cycles render of the same model, at 64 samples, with .10 strength denoising, in 8k (7680*4320). This render took just 19 minutes. (I’m linking straight to the file because it’s too large to upload here.

Can you notice the difference?

I would have liked to do more tests with more variables, and to bridge the sample gap between HD and 8K: 2K, 3.2K, 4K, and 6K. But it’s getting late and I want to go to bed.

Does anyone else have any experience with this? I know I’m likely not the first one to notice this, and of course there’s tradeoffs: the amount of RAM the 8K render used was 20 times that of the HD render (2Gb vs 100Mb).

So, what do you guys think? Please let me know and share your insights.

Take care!

1 Like

Interesting, I have a 4k monitor, there is not much difference, the bigger one a bit better, a more testing subject may show differences better.

I guess scaling any image smaller makes it look sharper, better. 4 pixels info to be represented by one. Compared to one to one, or worse one up scaled to 4. Wonder why it was faster bigger though.

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