Dell E521 Owner's Manual - Page 108
Audio, Expansion Bus, Drives, and Media Card Reader
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Audio Type Sigmatel 9227 CODEC (7.1 Channel audio) Expansion Bus Bus type PCI 2.3 PCI Express 1.0A SATA 1.0 and 2.0 USB 2.0 Bus speed PCI: 133 MB/s PCI Express: x1 slot bidirectional speed - 500 MB/s x16 slot bidirectional speed - 8GB/s SATA: 1.5 Gbps and 3.0 Gbps USB: 480 Mbps high speed, 12 Mbps full speed, 1.2 Mbps low speed PCI connectors two connector size 124 pins connector data width (maximum) 32 bits PCI Express connector one x1 connector size 36 pins connector data width (maximum) 1 PCI Express lane PCI Express connector one x16 connector size 164 pins connector data width (maximum) 16 PCI Express lanes Drives Externally accessible: Bays Available devices Internally accessible: one 3.5-inch drive bay (FlexBay) two 5.25-inch drive bays Serial ATA drives (4), floppy drive, USB memory devices, CD/DVD drive, and Media Card Reader two bays for 1-inch high serial ATA hard drives 108 Appendix
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