I have a maxed out 27 with two 768 apple blade ssd, one on the blade connector and one the regular sata, with the blade ssd to regular sata adpter that i got it from ebay. It runs perfect on RAID 0. Now my friend bought a maxed out with fusion drive, also bought a 256 blade ssd from ebay and a 256 samsung 840 pro. He love my machine but he cant afford the extra 1400 bucks on storage, and he does not want to run them on RAID 0 So i did the upgrade for him and everything works. he wants to know where he should run the os? Apple blade 256 since it has native trim support or samsung 840 pro with 20% overprovisioning and no TRIM? Thank you all.