PathTracing render crashing 2048 samples at 2K

Development Rendering
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I’m trying to do a render using Pathtracing in UE 5.1 but is crashing in the first frame.

The video size is 1920x1080, If I do it at 1024 samples it works, but the image is too grainy. If I increase to 2048 the GPU rans out of memory and crashes. And the sequence is only 45 frames.

I made a render months ago with the same Level in UE 5.0 in 4K and worked perfectly, I don’t know if is an issue with the update to 5.1. And this scene was 300 frames.

I’m using a Quadro RTX 4000

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Made more tests, the crash always happens when I use 2048 samples, doesn’t matter the size. I did the render in 960x540

image

Then I rendered the same scene in 4K with 1024 samples and doesn’t crash, so I think that for the moment to have working renders I have to render it twice the size of what I need.

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You are limited by your graphics card. You need a better graphics card to render in a higher resolution. Alternatively lower the samples.

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I am also having the same issue with UE 5.4 using pathtracing over 1024 samples. I never had this issue previously rendering 2k or 4k. I have a 4090, I don’t think that a simple studio, single frame render in pathtracing should exceed 24GB of VRAM.
Has anyone found a solution to this?