Bests & Worsts Reviews from Amazon

If you are looking at this card you probably want a card which will allow your SATA 3 hard drives to function on an older SATA 2 motherboard. The good news is this card will do that (at least for me on Win7 64bit). The bad news is there are many variations of the PCI-E interface and this card based on the Marvel 88SE9215 which is only an X1 device. That means that you will only get a single channel for your data (X1) and that the ability to get a SATA 3 speed is greatly reduced. For example, my SATA 3 Samsung 850 EVO SSD should be getting > 500MB/s but on this 88SE9215 controller I am only getting an average of 333MB/s. Technically, the speed I am getting is > 300MB/s so it can be called SATA3, but barely. What you want is the other IO Crest card in this group based on the 88SE9235. It is only a few bucks more but is an X2 device and should allow more data flow closer to 500MB/s. I'll update this when I get the 88SE9235 installed. ++ UPDATE ++ Removed 88SE9215 and installed 88SE9235 (which is X2). Once I got the drivers installed, the transfer rate stabilized and my Samsung 850 EVO SSD averaged a transfer rate of 425 MB/s. I'm pretty happy with that. To recap, 850 EVO SSD - SATA2 motherboard connectors= 245MB/s, 88SE9215 (X1) = 333MB/s, 88SE9235 (X2) = 424MB/s.