The SRT actually only allows up to 64GB to be utlized for caching anyways so it will do what you want fine. I do believe that you will be required to create two partitions before hand. Just be sure to set the Intel storage controller to RAID mode.
Thank you for the information.
I have one more question though. I have looked through the setup of SRT, and I have only seen 20gb and 64 gb setup choices. If I Partition this 120 sb ssd as 50 gb and 70 gb, will SRT have a problem with the 50 gb size?