Review on IO Crest Controller Non Raid SI PEX40064 by Christopher Lance

Looking at this card, you probably want a card that will allow your SATA 3 hard drives to run on an older SATA 2 The good ones News is that this card will do it (at least for me on Win7 64bit). The bad news is that there are many PCI-E interface options and this card is based on the Marvel 88SE9215 which is an X1 only device. This means you only get one channel for your data (X1) and your ability to achieve SATA 3 speeds is severely limited. For example, my Samsung 850 EVO SATA 3 SSD should be >500 MB/s, but on this 88SE9215 controller I'm only getting 333 MB/s on average. Technically the speed I'm getting is >300MB/s so it could be called SATA3 but probably not. You need another IO Crest board in this group based on 88SE9235. It's only a few bucks more, but it's an X2 device and should be able to transfer more data, close to 500MB/s. I will update this when I install 88SE9235. ++UPDATE++ Removed 88SE9215 and installed 88SE9235 (which is X2). After installing the drivers, the transfer speed stabilized and my Samsung 850 EVO SSD averaged 425 MB/s. I am very happy with it. In summary: 850 EVO SSD - SATA2 motherboard connectors = 245 MB/s, 88SE9215 (X1) = 333 MB/s, 88SE9235 (X2) = 424 MB/s.