It's not about the file system, Mavericks does not support NVMe drives because it does not have any NVMe drivers.Q1. I've encountered certain older SSDs that, for whever reason, will fail to treat an APFS partition + OS as a viable boot option (i.e., it won't appear on the Mac option-key boot list), but have never heard of one that won't for HFS+ (AKA MacOS Extended-journaled, which is what Mavericks uses), which has a maximum volume size of 9 exabytes.
...so, it's actually a Hackintosh, purpose-built for Mavericks compatibility. I have an Intel i7 4790K, an nVidia GTX 780 Ti, and 32 GB DDR3 memory running at 2400 MHz. And, for the moment, a 4 TB Samsung 860 Evo.Q2. What are you running Mavericks on that is even fast enough to fully utilize a hugely expensive >4TB SSD?
It's just that from a UX perspective, I really don't want to spend time thinking about which files go on which drive. I guess I could set up a Fusion drive, I just haven't heard great things about them....you'd be better ioff with a 500gb or 1T for your primary, and saving the money for a big 12TB or larger spinner.
Or maybe I get a second 4 TB SSD and make an 8 TB Fusion drive out of those? I'm not sure if it will confuse OS X to have a Fusion drive out of two drives that are the same speed.
...Or I could get a second 4 TB SSD and set up RAID 0, which as a side effect would actually improve performance. I'm a bit scared to do that, but I do use Time Machine for backups...