Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower -

"num samples per thread reduced to 32768 — per-thread sampling was clamped to prevent long-running GPU threads; total samples will be achieved by additional dispatches, which may increase render time."

Right-click, select (or QWORD 64-bit depending on your OS). Name it TdrDelay .

: Rendering in 4K or higher requires significant memory for image buffers. "num samples per thread reduced to 32768 —

For Blender Cycles (as of 4.0+), this parameter is not user-accessible in the UI. However, you can set it via Python script:

: It minimizes the immediate memory footprint of the active rendering kernel, preventing a total GPU crash. For Blender Cycles (as of 4

Suppose you’re rendering a image (about 2 million pixels). You set 256 samples per pixel . Total samples = 2M × 256 = 524 million.

: Use the "Resize Textures" option in V-Ray settings or convert textures to Limit Background Usage You set 256 samples per pixel

: While the render may still finish, it will likely be significantly slower because the GPU is no longer working at its most efficient capacity. Chaos Forums Primary Triggers Insufficient VRAM

: The render will still complete, but it will be slower because the hardware has to process many smaller tasks instead of fewer, larger ones.