An IT technician is specifying a replacement power supply unit (PSU) for a CAD workstation… — CompTIA A+ (Core 1 & Core 2)

An IT technician is specifying a replacement power supply unit (PSU) for a CAD workstation upgrade. The system components have the following rated maximum power requirements: CPU at $105\text{ W}$ , graphics card at $225\text{ W}$ , and remaining motherboard components, storage drives, and cooling fans at $70\text{ W}$ combined. To ensure operational stability and system longevity, company policy requires a minimum power safety headroom margin of $25\%$ above the total peak power draw. Which of the following is the minimum power supply wattage rating the technician should select to meet this requirement?

$500\text{ W}$ Cevap
B
$400\text{ W}$
C
$330\text{ W}$
D
$225\text{ W}$

Cevap

500\text{ W}

is the minimum required rating to safely power the system with a

25\%

safety margin.

The total system power consumption under load is calculated as

105\text{ W} + 225\text{ W} + 70\text{ W} = 400\text{ W}

. Applying the required

25\%

safety margin (

400\text{ W} \times 1.25

) yields

500\text{ W}

, which ensures reliable system operation without exceeding safe load thresholds.

Adım Adım Çözüm

Calculate the total peak system power consumption by summing individual component wattages.

105\text{ W} \text{ (CPU)} + 225\text{ W} \text{ (GPU)} + 70\text{ W} \text{ (Peripherals/Motherboard)} = 400\text{ W}

Power supply sizing must account for all connected system hardware under full load.

Apply the

25\%

safety headroom buffer requirement to the calculated total peak draw.

400\text{ W} \times 1.25 = 500\text{ W}

Adding headroom prevents PSU overload during transient power spikes and maintains efficient operation.

Anahtar Kavram

Calculating Power Supply Unit Wattage and Safety Headroom Margins

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

Bu konudan daha fazla soru