So, of four respondents, one mentioned video editing, another spoke of VMs, and a third cited the price range of $150 to $200 for either another 2x8 kit or replacement-with-resale and the additional outlay for a 4x8 configuration or 2x16 kit. Somebody mentioned "caching a game" in RAM, unspecific to what was meant by "caching."
I would certainly question the cost-effectiveness of spending another $180 to boost my 2x8 to a 4x8 configuration. Of the additional 16GB, 8GB is allocated as a true Ram Cache for a 960 Pro NVMe drive, and 8GB is allocated in two-tiered caching of a large ~ 2TB SATA device (either HDD or SSD in principle), using a 250 GB EVO NVME to cache the drive as well.
Here's the benchies, without putting any spin on interpretation, and I will allow others to do that. But after considering that I went for the less expensive and simpler proposition of simply adding another 2x8 kit, I won't tell myself that I completely wasted the money. This is the latter two-tier-cached SSD. These scores would be about the same using an SATA HDD of the same size, and they are approximately the same as I get with the RAM-cached boot-drive 960 Pro:
https://postimg.cc/image/a237mlcaj/
In addition to the expense of the extra RAM kit, the
PrimoCache software license was about $25/workstation.
PS. You could think about 64GB of RAM, but I'd be curious about the improvements of allocating part of 32GB in video editing in face of the trade-off with having more RAM available for the editing program and working file-data.