A system builder is selecting a power supply unit (PSU) for a custom workstation. The plan… — CompTIA A+ (Core 1 & Core 2)

A system builder is selecting a power supply unit (PSU) for a custom workstation. The planned hardware components have the following continuous power demands:

- Central Processing Unit (CPU): $105\text{ W}$
- Dedicated Graphics Card (GPU): $250\text{ W}$
- Solid-State Drives and Cooling Fans: $45\text{ W}$
- Sound Capture Expansion Card: $20\text{ W}$

To prevent power throttling and allow for system longevity, the technician specifies that the total power consumption under full load must not exceed $80\%$ of the power supply's total rated wattage rating (providing a $20\%$ safety capacity margin). Which of the following is the minimum PSU wattage rating required for this system?

A
$420\text{ W}$
$525\text{ W}$ Cevap
C
$504\text{ W}$
D
$370\text{ W}$

Cevap

The minimum recommended power supply unit rating is

525\text{ W}

The total continuous power draw of all components is

105\text{ W} + 250\text{ W} + 45\text{ W} + 20\text{ W} = 420\text{ W}

. To ensure this total load does not exceed

80\%

of the power supply's continuous capacity rating, divide

420\text{ W}

0.80

, which equals

525\text{ W}

Adım Adım Çözüm

Calculate total continuous component power draw

105\text{ W} + 250\text{ W} + 45\text{ W} + 20\text{ W} = 420\text{ W}

Sum all individual hardware power requirements across CPU, GPU, drives/fans, and expansion cards.

Apply the 80% maximum target load constraint

\frac{420\text{ W}}{0.80} = 525\text{ W}

Dividing total power draw by 0.80 establishes the minimum rated PSU wattage needed so that 420 W represents exactly 80% of total capacity.

Anahtar Kavram

Power supply unit (PSU) wattage calculation and safety headroom planning

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

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