Hi I currently have a 2013 iMac with 256GB pciE SSD and few weeks ago I added a 3TB HDD to create a custom Fusion Drive. Have been work great and yes I sacrifice few hundreds MBs for the space. Since I don't need to much space I was wondering if I can create a fusion with a 512gb or 1tb sata SSD like the samsung 840 with the apple SSD. I still not get fastest speeds like pciE SSD alone but will be faster in theory since it will be storing the data in another SSD instead in the hard drive. I was wondering if someone already did and share your thoughts. Thanks!