As others have said, I had boot problems using Windows 10. I changed my boot disk to Nvme which meant having 2 SATA ports on my board (MSI B450 Tomahawk) were lost. I bought this card to fix this as I have 4 extra hard drives for data storage/backup etc. When I attached hard drives to this card, it wouldn't boot into Windows - it just froze at either the Windows logo or a black screen. I tried many settings in bios but it didn't work. So instead I connected two optical drives to this card and all 4 SATA drives to my board and haven't had any problems since. I contacted the seller to see if I could get a driver disk but they replied with nonsense (very broken english that made no sense).
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