After running some jobs with your settings, it appears that both of your jobs currently require about 12 GB of GPU memory. We are working on an optimisation that will reduce the memory usage by several GB, and we will let you know when it’s available. Based on our preliminary testing with the optimisation, these jobs will fit in 8 GB of memory if an output f-crop factor of 3/4 is used.
@DaveT, Unfortunately, there’s no way to increase the memory available to the GPU. The GPU has it’s own RAM, separate from system RAM, that’s physically located on the card. Could you let us know what GPU model you’re using so we have some idea of the memory constraints?