Is Buffer Pool Extension (BPE) needed if my database is already on SSD?

Here is my simplified scenario, let’s say I have one (and only one) database of 500GB on SQL Server 2016 EE, this database is on SSD drives already (both data and log files), and my server has 64GB memory, I am thinking to add another SSD drive (let’s assume this SSD is of same performance as other SSD drives in the server), and use this new SSD drive for BPE (buffer pool extension) feature, the question is: since my database is already on SSD, does it make sense (or do I get any gain) if I enable BPE in this scenario?

Thanks,
Jeff_yao