Basic, comparatively low-performance cards: This type of card offers a cost-effective solution to connect SCSI devices that do not need a substantial amount of bandwidth, for example, SCSI scanners and CD-ROM drives. These types were quite common until 2000; however, most of them became obsolete afterward. The innovations in IDE technology, especially in the case of CD writers and CD-ROM drives, added to their downfall. Also, the introduction of the Universal Serial Bus (USB) made SCSI interfaces avoidable for the majority of scanners.
High-end cards: These cards are built for optimum functionality, generally for incredibly high-speed hard disk drives and particularly for scenarios that demand multiple high-speed drives (especially servers). These cards are comparatively expensive.
