Run a program like Speccy to tell us the disk you have.
http://www.piriform.com/speccy
The ol' Bob D'Niro line from "Taxi Driver:" "You talkin' to ME?! You talkin' . . . to ME?!"
Below is the speccy text from the sig-rig. The 2700K rig has a similar HDD (SATA-II) cached to a Blaze 60GB SSD (SATA-III), with 840 EVO boot-disk cached with RAPID. Speccy isn't installed there. the sig-rig only has RAPID caching. Is it important to you?
I've also got an old 2007 Centrino Duo lappie with SATA-II controller and an SSD cached to RAM. Don't know what relevance that has.
Summary
Operating System
Windows 7 Professional 64-bit SP1
CPU
Intel Core i7 2600K @ 3.40GHz 35 °C
Sandy Bridge 32nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 933MHz (9-9-9-24)
Motherboard
ASUSTeK Computer INC. P8Z68-V PRO (LGA1155) 28 °C
Graphics
BenQ XL2420Z (1920x1080@60Hz)
TX-NR616 (1920x1080@60Hz)
3071MB NVIDIA GeForce GTX 780 (ASUStek Computer Inc) 36 °C
Storage
476GB Crucial_CT512MX100SSD1 ATA Device (SSD) 30 °C
931GB Western Digital WDC WD10EZEX-00RKKA0 ATA Device (SATA) 30 °C
476GB Samsung SSD 840 PRO Series ATA Device (SSD) 28 °C
Optical Drives
CD-ROM Drive
Audio
High Definition Audio Device
===
Oh. Just to clarify, because I was puzzled at how the linked WD Black HDD-SSD-combo unit actually works. I've used ISRT and Primo-Cache (the lappie drive) for caching (RAM or HDD_to-SSD respectively) and never had a problem with BSODs or instability with those solutions. I don't think I ever came across anyone with such instabilities or difficulties if their ISRT or other caching solution was properly configured.