Download Dell Precision 620 User`s guide
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Drives two serial ATA controllers supporting one device each and one parallel Ultra ATA/100 IDE supporting two devices per channel with one channel Expansion Bus Bus type PCI 2.3 SATA 1.0a and 2.0 USB 2.0 PCI Express 1.0a Bus speed PCI: 33 MHz SATA: 1.5 Gbps and 3.0 Gbps USB: 480 Mbps PCI Express x1: 5 Gbps PCI Express x16: 80 Gbps Cards half-length, full-height cards supported with optional riser-card cage Default: no riser-card cage low-profile cards supported PCI connectors two card size low profile connector size 120 pins connector data width 32 bits (maximum) PCI Express connectors one x16 card size low profile power 25 W maximum connector size 120 pins (x16) connector data width (maximum) 16 PCI Express lanes (x16) Optional: full-height PCI Express riser-card cage low-profile and full-height cards supported PCI connectors two card size one low-profile card and one full-height card connector size 120 pins connector data width 32 bits (maximum) PCI Express connectors one x16 card size full-height power 25 W maximum connector size 120 pins (x16) connector data width (maximum) 16 PCI Express lanes (x16) Optional: full-height PCI riser-card cage low-profile and full-height cards supported PCI connectors three card size one low-profile card and two full-height cards connector size 120 pins connector data width 32 bits (maximum) Drives Externally accessible one 3.5-inch drive one bay for CD/DVD or optional second hard drive Internally accessible one bay for a 1-inch-high hard drive Connectors External connectors: Serial 9-pin connector; 16550C-compatible Parallel 25-hole connector (bidirectional)