A technician is installing a PCIe x4 RAID controller expansion card rated at 35\text{ W} T… — CompTIA A+ (Core 1 & Core 2)

A technician is installing a PCIe x4 RAID controller expansion card rated at $35\text{ W}$ TDP into a desktop workstation. The card has no external auxiliary power connectors on its PCB. The motherboard features an available physical PCIe x16 slot (wired electrically at x4) and several PCIe x1 slots. Which of the following is the most appropriate installation approach to ensure the card operates correctly?

Install the expansion card directly into the physical PCIe x16 (wired x4) slot, as motherboard PCIe x4/x16 slots can provide up to $75\text{ W}$ of power directly through the slot interface.Cevap
B
Upgrade the system power supply unit (PSU) to a modular model, as any expansion card consuming over $25\text{ W}$ requires a dedicated $+12\text{ V}$ EPS power cable.
C
Connect an 8-pin PCIe auxiliary power cable from the power supply directly into the card's PCIe bus edge connector before inserting it into the slot.
D
Modify the card using a PCIe x1 riser adapter to fit into a PCIe x1 slot, as all PCIe slots provide identical power delivery regardless of slot length.

Cevap

Install the expansion card directly into the physical PCIe x16 (wired x4) slot, as motherboard PCIe x4/x16 slots can provide up to

75\text{ W}

of power directly through the slot interface.

PCI Express expansion slots on desktop motherboards are designed to deliver power directly to installed cards. Standard x4, x8, and x16 full-height slots can deliver up to

75\text{ W}

of power. Since the RAID controller card requires

35\text{ W}

and has no auxiliary power headers, placing it in the physical PCIe x16 (wired x4) slot ensures sufficient electrical power and full x4 lane performance.

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Evaluate the power requirements of the expansion card

The RAID controller requires

35\text{ W}

of power and lacks auxiliary power input headers.

Cards without auxiliary connectors rely entirely on motherboard slot power.

Check motherboard PCIe slot power delivery standards

Full-height PCIe x4, x8, and x16 motherboard slots are standardized to deliver up to

75\text{ W}

of power directly via the slot connectors.

The

35\text{ W}

draw falls well below the

75\text{ W}

limit of the physical PCIe x16 (wired x4) slot.

Select the proper physical slot for installation

Inserting the PCIe x4 card into the physical PCIe x16 (wired x4) slot provides both full mechanical fit, maximum electrical bandwidth, and adequate power delivery without extra cables or PSU modifications.

PCIe slots support down-plugging where smaller cards operate seamlessly in larger physical slots.

Anahtar Kavram

PCI Express Bus Power Limits and Mechanical Compatibility

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