I see no mention of a feature similar to the "controversial" Samsung RAPID.
Over the last six months, I'd experimented with a caching program called "Primo-Cache" on my laptop. Some of the criticisms of Primo were off the mark -- for instance, that it didn't do "block-level" caching -- but it does.
I have just two strategies in storage configuration for my Sandy or later systems:
Use a larger SSD (512GB or larger) for boot/system/programs.
Use a hard-disk for video capture and file storage where file access doesn't affect performance.
I'd previously had a small SSD configured for ISRT with IRST, and it worked fine.
My latest system-build only has a 256GB Samsung SSD boot-system disk. Right now, it also contains a 500GB WD Blue HDD, to which I've installed my first game download.
The laptop uses a Crucial MX100 with Primo.
So I'm contemplating some options for the second system, which was set up in AHCI mode to use the RAPID feature as I may have wanted it to.
1) I could reconfigure the system in RAID-mode so that I can use a small SSD with the HDD and ISRT. This would prevent use of RAPID.
2) I can connect the small SSD and the HDD to a spare PCI-E controller with a Marvell controller chip. Then I can use Marvell's Hyper-Duo to do the caching. This would also be in RAID mode for that particular controller.
3) I can leave everything in AHCI-mode and install Primo-CAche. Then I would configure an "L3 cache" in Primo to cache the HDD to the small SSD.
(3) seems to be the most convenient of the options. Whether it would somehow "collide" with RAPID, I can't say. But I could disable RAPID, create an equivalent RAM-cache for the Sammy drive in Primo, and create an SSD-cache for the HDD in Primo.
[Any thoughts or insights on my prospects are welcome -- just don't "diss" the Primo-Cache program. It didn't miss a lick in my 90-day trial usage, and so I bought the 3-PC license for it. The laptop is a 2007-vintage Centrino-Duo, works perfectly with its wireless-N connection, and just seems . . . . fast . . . for such an old executive-style lappie.]