Been looking at the Z68 motherboards, like the idea of using the SSD as cache, but don't see any good deals on any right now so can I add the SSD later without having to reinstall Windows 7?
Second question is, if you have a SSD installed, and it dies, do you have to then reinstall Windows?
For Question #2 -- No, provided that (a) you choose "Enhanced" versus "Maximum" mode in the ISRT configuration within Windows, and (b) your SSD-death doesn't occur with a BSOD or abnormal shutdown using "Maximum" mode.
Tentatively -- as far as I know -- you should be able to change between "Enhanced' and Maximum" once you've made the initial setup. Worth looking into, but -- really -- I think this is likely given things that I've read about simply "uninstalling" the configuration to do this or that . . .
And to Question #1 -- Answer to #2 implies "Yes" to adding the SSD later. Apparently, the procedure for setting up requires installation of Win 7 (etc.) without the SSD connected, followed by installation of the ISRT software in Windows. Then, you hook up the SSD after shutting down, boot up and configure within Windows.
But -- very important, and here's where there may be a problem (I'm thus backtracking a bit.) You do not configure the hard drive in "IDE" mode; you do not configure the hard drive in ACHI mode. It must be configured within BIOS in "RAID" mode. Since you then install the OS on that configuration, I can't see any problem with running it that way for any length of time while you wait for the SSD. It just gives you a little pause for thinking about it. . .
In my case, I couldn't help myself: I didn't want an SATA-II SSD. I finally opted to avoid using an SATA-II hard disk. Finally, I didn't even want to satisfy myself with the mainstream Caviar Black HDD. After looking at the benchmark results for use of such a drive -- which still showed stunning performance, I imagined what the marginal improvement with VelociRaptor would give. I probably wasted the extra bucks for too little bang, but it was the first Raptor I ever bought.
Point being -- I'd lean toward the SATA-III SSD's, but you can really skimp on the capacity if you can find a 60+GB model. Fact is, you can only create a cache size maximum of 64GB. And further -- the stunning performance benchmarks were made with a 20GB cache.
Intel may have seen all this coming, since they developed the technology themselves. Oddly, their SATA-III Elm-Crest drives are limited to a minimum 120GB capacity (although you can use the remainder in a partition as a you'd use an SSD for regular purposes.) And I say they saw it coming to announce release of a 20GB "Larson-Creek" SATA-III SSD.
Which . . . . hasn't been released yet . . . when you might decide that that's the one you want specifically for this purpose . . .