Why do sound cards for PCs have three irregular pin slots in them to fit into a PCI or PCI express slot? How do you connect (Windows 10)? - Quora
![Amazon.com: Creative Sound Blaster ZxR PCIe Audiophile Grade Gaming Sound Card with High Performance Headphone Amp and Desktop Audio Control Module : Electronics Amazon.com: Creative Sound Blaster ZxR PCIe Audiophile Grade Gaming Sound Card with High Performance Headphone Amp and Desktop Audio Control Module : Electronics](https://m.media-amazon.com/images/I/71Y4hj-Tu-L._AC_UF894,1000_QL80_.jpg)
Amazon.com: Creative Sound Blaster ZxR PCIe Audiophile Grade Gaming Sound Card with High Performance Headphone Amp and Desktop Audio Control Module : Electronics
![Amazon.com: Creative Sound Blaster Audigy FX PCIe 5.1 Sound Card with High Performance Headphone Amp : Everything Else Amazon.com: Creative Sound Blaster Audigy FX PCIe 5.1 Sound Card with High Performance Headphone Amp : Everything Else](https://m.media-amazon.com/images/I/71eTQKa5oAL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Creative Sound Blaster Audigy FX PCIe 5.1 Sound Card with High Performance Headphone Amp : Everything Else
![Amazon.com: Creative Sound Blaster Audigy PCIe RX 7.1 Sound Card with High Performance Headphone Amp : Electronics Amazon.com: Creative Sound Blaster Audigy PCIe RX 7.1 Sound Card with High Performance Headphone Amp : Electronics](https://m.media-amazon.com/images/I/81kQAMr6uJL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Creative Sound Blaster Audigy PCIe RX 7.1 Sound Card with High Performance Headphone Amp : Electronics
![Sound Blaster X4 - Hi-res 7.1 External USB DAC and Amp Sound Card with Super X-Fi® and SmartComms Kit for PC and Mac - Creative Labs (United States) Sound Blaster X4 - Hi-res 7.1 External USB DAC and Amp Sound Card with Super X-Fi® and SmartComms Kit for PC and Mac - Creative Labs (United States)](https://d287ku8w5owj51.cloudfront.net/images/products/large/pdt_23705.png?width=1000&height=800&trim.threshold=80&margin=50)