I recently saw a picture of a SCSI connector when looking for PCIe - SATA cards.

Apparently most normal PCIe - SATA cards are very unreliable (somehow even worse than USB to SATA adapters), so I went on looking for the SCSI ones that have been reviewed as more reliable.

P.S. If anyone knows about a (non-RAID) PCIe - SATA card that I can rely upon as much as my motherboard SATA controller, then do tell.