I have a Mac Pro 4,1 (early 2009) and wish to install El Capitan v10.11.6 as a fresh new OS on a Samsung 850 EVO - 1TB. AS expected I have read allot about this particular drive having issues with TRIM support under Mac OS not to mention that the interface on the Mac Pro 4,1 is SATA II and I see that only SATA III supports "queued TRIM Commands". Of which I have not a dam clue WTF this means but am concerned of how any of this may effect TRIM on the drive under Mac OS ether by HOW TRIM is enabled or if it SHOULD BE enabled under these conditions at all / also vs. firmware updating the SDD and vs. NOT firmware updating the SSD in comparison conditions. Here are all my questions for this setup and if anyone has any direct experience with this: 1. Should the Samsung 850 EVO be firmware updated prior to installation? This would require connecting the drive via USB to an existing Windows machine with the Samsung Magician software installed to SEE if any firmware updates are available since Samsung gives NO firmware info on this drive anywhere on their download website and only refer you to install the Magician Software to service and maintain the drive - yet its a Mac compatible drive as per Samsung with no Magician software for Mac OS - Sweet Bastards!! 2. Should TRIM be enabled (even though it is being installed on a Mac SATA II interface) and if so what is the best way to do it....should it be enabled via the terminal trimforce command in El Capi or should I actually download and install Disk Sensei - $20.00? Cindori states that their software is a "better and safer way" to enable TRIM in El Capi instead of using the trimforce command...is this true? Read the comments here on their website: Using Disk Sense. If you enable the trimforce command in El Capi should something else be done first so it actually "Sets" properly - like disable SIP or something else security related? If anyone has vetted out best performance and reliability of this SSD on a SATA II interface (with & without TRIM enabled in OS / various ways to enable TRIM / firmware updated / firmware NOT updated) your comments and findings would be highly appreciated. Thanks allot in advance!