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The bottom line with this is that we are all just trying out stuff and reporting back. We are all learning together.

Exactly Especially since I can see minor but perceptible differences between v4.15 and v4.15v2 that I don't remember seeing in other models.

You're just going to have to experiment and see what works best for you. Most of my movies work well with almost any SC or even turning it off. But I've got a couple that need SC to be set to I had to find a balance.

If you have to use Rife v2 and have picture shaking issues then updating vslmrt makes sense.  I reset everything back to default (minus some script changes) then updated to TRT8.6. Not going beyond that unless someone can show me how TRT9 improves things*. Not sure why anyone would update to TRT 10.

Update:
*TRT9 is required if you are using Rife v2 and have the picture shaking issue.

While it's no longer significantly faster, the release notes say it reduces "PCie traffic flow". From personal experience this helps a lot for real time processing and provides more GPU headroom. Before I started to use downscaling, I was regularly hitting 100% GPU, but the v2 models would bring that down to 90% or less depending on the model.

But @Chainik thanks for the reminder because it's been a while since I used a non v2 model and unlike previous models, v4.15 seems to handle artefacts a "touch" better than the v2 version.

There was a bug with Rife v2 which has been fixed since vslmrt script 3.18.4 released November last year. I think this bug caused picture shake issue.

I know you are not replying to me but I think your comments are interesting so I hope you don't mind me responding directly to you. As you say, there is a massive performance hit. But you have been very lucky if you haven't come across the horrible artefacts that appear below 4.9.

Being "trained on Anime" or not doesn't matter if it still results in improved live action motion. Rife v4.9 and above are all smoother and have much less visible artefacts than below 4.9.

Resolution is important but only up to a point. Although I personally would not downscale to 720p I do now downscale my 1920x2160 3D blu-rays to 1080p.   On a near IMAX VR screen, I've tried both upscaling to 4K and downscaling to 1080p and found no "visible" difference between the two. For actual 4K content there is a difference, but it will only be a problem on very large of screens. For most people watching on a TV, there will be little visible difference unless you decide to stand in directly in front of the screen.

BTW Apologies but I just did a Google search and the OID is the name that kept on coming up.  I didn't know that it was for images only until after you said yes and I investigated a bit more. So I am really interested in finding out the actual name of this Intel denoiser.

Which one is it? The Open Intel Denoiser?

I just tried CuNNY and 4x32 is the best option matching FSRCNNX_x2_16-0-4. But CuNNy 4x32 is similar to nnedi32 in that it's heavier on GPU, especially when using SVP.

I didn't choose it. This is the standard resolution for 3D blu-ray.

1920x2160.

I downloaded the latest version of MPC-BE today and I realised a few things. Firstly, for users with lower spec GPUs, MPC is the best choice over MPV because MPV is basically MPC+MadVR. If you want to add MadVR then MPV is more efficient and uses less resources.

The other thing I realised is that if you play a video file with HD audio connected to an external amp it uses about 20% more GPU. Using the GPU makes sense, I just didn't realise how much GPU is potentially used.

Higher than FHD but definitely not 4k. At FHD I can run a little higher at 75fps.

BTW After more testing with the default TRT 8.5.1, Rife v4.16 lite and v4.15 lite are almost identical. Rife v4.15 is slightly better than both. I don't know about anyone else but for me, it looks like I should have stuck with the default TRT.