Installing System Components 119Installing the Cable Retention Bracket1 Insert the hooks and tabs of the cable retention bracket into the slots inthe chassis wall and slide the bracket back until the latch engages.2 Install the cooling fan bracket. See "Replacing the Fan Bracket."3 Install the cooling shroud. See "Installing the Cooling Shroud."Expansion Cards and Expansion-Card RisersThe system supports up to four PCI Express (PCIe) expansion cards on twoexpansion-card risers.• Expansion-card riser 1 provides two PCIe x4-link Gen 2 expansion slots.• Expansion-card riser 2 is offered in two versions:– The standard expansion-card riser 2 provides two PCIe x8-link Gen 2expansion slots.– The optional expansion-card riser 2 provides one PCIe x16-link Gen 2expansion slot.CAUTION: Expansion cards can only be plugged into the slots on the expansion-card risers. Do not plug any expansion cards into the riser connectors on thesystem board.To identify expansion slots, see "Expansion-Card Riser-Board Componentsand PCIe Buses."Expansion Card Installation GuidelinesObserve the following notes and guidelines regarding the expansion-cardslots:• PCI Express Generation 2 and Generation 1 expansion cards are supportedin all slots.• In slots 2, 3, and 4, expansion cards can have a maximum length of 24.13cm (9.5 in). Slot 1 supports a full-length (30.99-cm [12.2-in]) expansioncard.• The system supports three full-height expansion cards and one low-profileexpansion card (slot 2).• Although slots 1 and 2 are physically PCIe x8 connectors, they functiononly as PCIe x4-link slots.
