Amazon QuickSight now supports larger SPICE datasets on the Enterprise Edition. Earlier each SPICE dataset could hold up to 250 million rows and 500GB of data. Now, all new SPICE datasets can accommodate up to 500 million rows (or 500GB) of data in the Enterprise Edition and 25 million rows (or 25GB) for Standard Edition. This raises the limit for your datasets, letting you accelerate dashboards with more data. See here for details.
This is a companion discussion topic for the original entry at https://aws.amazon.com/about-aws/whats-new/2021/10/amazon-quicksight-spice-capacity-limit/