Hi, First my setup: Mac Pro 5,1 (2010) with BluRay drive in optical bay, under it there is an Icy Dock with the SSD in it. Then all four other drive bay are in use with 1TB drives. Last year i put an OWC Mercury Extreme pro ssd in the Icy Dock. I did test and i remember seeing about 200meg/sec performance, not the actual 275 but close too and it was fast enough... But since a couple of month performance decreased to about 80 meg/sec !? Also the drive was more than 80% full, on the 60G, only 8G where free. I also tried to enable the TRIM, but nothing good, and i lost the ability to put the MacPro to sleep... So, i bough a new SSD: KINGSTON SV300S37A120G, so now i have enough free space. I must say that i did clone the older drive onto this one using Carbon Copy Cloner. I still have the same performance? even after i've upgraded the OSX from 10.7.5 to the latest 10.9.1. At least it is now going to sleep by itself but the performance is poor, that ssd is capable of going at 480meg/sec! So, what i'm missing ?