A systems technician is configuring a video editing workstation. The peak power requiremen… — CompTIA A+ (Core 1 & Core 2)

A systems technician is configuring a video editing workstation. The peak power requirements for the hardware components are as follows:

- Central Processing Unit (CPU): $105\text{ W}$
- Two dedicated PCI Express capture cards: $75\text{ W}$ each
- Motherboard, system RAM, and active cooling fans combined: $85\text{ W}$

To prevent system instability and maintain PSU power efficiency, IT policy dictates incorporating a $25\%$ safety headroom buffer above the total peak component power draw. What is the minimum recommended power supply unit (PSU) output rating, in Watts ( $W$ ), required for this build?

Answer: 425 W

Answer

The minimum recommended power supply unit rating is 425 W.

To determine the required power supply capacity, sum the peak power usage of all individual components:

105\text{ W}

for the CPU,

150\text{ W}

(

2 \times 75\text{ W}

) for the capture cards, and

85\text{ W}

for the motherboard, memory, and fans, giving a total continuous load of

340\text{ W}

. Applying the required

25\%

headroom (

340\text{ W} \times 1.25

) yields

425\text{ W}

Step-by-Step Solution

Calculate the total baseline wattage requirement of all installed hardware components.

105\text{ W} + (2 \times 75\text{ W}) + 85\text{ W} = 340\text{ W}

total peak draw.

Both expansion cards must be accounted for alongside the CPU and core system components.

Apply the mandatory 25% safety headroom buffer to the total baseline wattage.

340\text{ W} \times 1.25 = 425\text{ W}

Adding a 25% margin ensures the PSU operates within its ideal efficiency curve and prevents thermal shutdown during power spikes.

Key Concept

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

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