Thanks! It looks like the 4x upscaling of that clip requires too much VRAM for this GPU.
RXL will scale to 4x size internally even when set to another output mode, so during processing it is actually trying to render a 5760x4320 output and running out of memory.
Updated: pasted wrong resolution at first
Another option that could help is to use this version of the rxl-1.json file. This one has the largest block size removed and may reduce VRAM utilization:
rxl-1.json (11.4 KB)