Yes you can. No, you should not. http://www.xbitlabs.com/articles/storage/display/kigston-hyperx-ssd-raid0_7.html#sect0
If you need the extra size (RAID0), you are much better off installing specific programs to the non-boot SSD as the D drive.
If you want the extra protection of RAID1, back-up your system drive regularly. Test that you can boot from a restore of the backup. Keep your data on the HDD so that restoring the OS backup will not lose your data.
RAID1 is not a substitute for backups.