If you are going to purchase a SATA 3 6Gb/s 64GB solid state drive, then Intel Smart Response Technology (ssd caching) is not necessary. According to Intel you would be better off and experience better performance if you installed Windows 7 and your software applications on the ssd instead of the hard disk drive. It makes more sense to to get the full benefit of the ssd instead of using it as a cache for a hard disk drive.
When Intel devloped SRT, they envisioned using a small 10GB to 20GB ssd as a cache for one hard disk drive. It was meant for individuals who could not afford a larger capacity ssd.
Starting mid-October and continuing through November a number of brand new ssd's will become available. It might be worth waiting a little bit to see how things play out.