174 Upgrade and Maintenance Manual TX120 S3
Expansion cards and backup units
In this chapter
● "Installing expansion cards" on page 176
● "Removing expansion cards" on page 180
● "Replacing expansion cards" on page 183
● "Installing a BBU" on page 188
● "Removing a BBU" on page 202
● "Replacing a BBU" on page 207
● "Mounting expansion card slot brackets" on page 215
● "Handling SFP+ transceiver modules" on page 224
9.1 Basic procedure
The system board is equipped with four expansion slots:
Figure 78: PCI slot overview
PCI slot Type Function
1 PCI 32 bit / 33 MHz
2 PCIe x1 (mechanical width: x4)
3 PCIe x4 Preferred slot for SAS HDD controllers
(mechanical width: x8)
4 PCIe x16 (mechanical width: x16)
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