Hello there, I've recently bought the Kingston V300 SSDNow and I've just made a clean installation (MAC OS Mavericks). Before having that SSD, I had a regular Seagate HDD (Momentus 7200rpm) which had a poor performance, as well as any other HHD: Before I bought the new SSD I thought, great I finally have SATA2 (I was thinking my Macbook Pro was only SATA1), so getting a brand new SSD will make a huge difference. But I guess I was wrong according to the performance and how the system feels: You can see both screenshots. And by the way, TRIM is enabled using TRIM enabler: I was hoping to stay with my old friend for a year and a half more, but I guess I will be buying a new Macbook Pro in 2014 if this is the maximum performance I can get I remember that for Mountain Lion there was a firmware that was supposed to fix an issue about SATA2 running as SATA1 speeds, but for Mavericks is not available and I don't remember if I installed it. Could be happening that? I have to go back to Mountain Lion in order to fix that and reinstalled Maverick again (that will be a pain in the ass, but if that fix everything I will do it) About this firmware, the currently SMC version is: Hope someone can give me a hint about this!