I just pieced together a band new computer with Asus AM1I-A mother board (AMD chipset) and installed a fresh Windows 8.1 on an SSD going straight to the MB. When I plug a SYBAUSA SY-PEX40039 sata controller in the PCIe slot it will not let the system boot to windows. It says there is an error and just loops with the recovery options. When I take it out, it runs fine. I also noticed though that it does recognize the hard drive I plug into the controller in the BIOS. When the computer starts it will show the card driver info and the hard drive info so it seems like that card is working and maybe I just have a setting wrong? I was able to get into windows safe mode and try to install the driver from their website but didn't help. Let me know if you need any other info and thanks for the help!