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Zorluk: ZorExpansion Cards and Power Supplies

A technician is sizing a power supply unit (PSU) for a video rendering workstation. The system components have the following power consumption characteristics:

- Processor (CPU): 125 W125\text{ W} base TDP, with short-duration power spikes reaching 250 W250\text{ W}
- Graphics Card (GPU): 300 W300\text{ W} TDP, with transient power excursions reaching 420 W420\text{ W}
- PCIe x4 Video Capture Expansion Card: 25 W25\text{ W}
- Motherboard, RAM, and NVMe Storage: 65 W65\text{ W} combined
- Liquid Cooling Pump and Fans: 40 W40\text{ W} combined

To ensure system stability during peak load events and prevent PSU safety shutdowns, the organization requires that total peak system power draw does not exceed 80%80\% of the PSU's maximum rated capacity. Which of the following is the minimum PSU wattage rating required for this workstation?

  1. A
    700 W700\text{ W}
  2. B
    800 W800\text{ W}
  3. C
    850 W850\text{ W}
  4. 1000 W1000\text{ W}Cevap

Cevap

The minimum power supply rating required is 1000 W1000\text{ W}.
The option specifying 1000 W1000\text{ W} correctly calculates total maximum power consumption by summing all component peak draws (250 W+420 W+25 W+65 W+40 W=800 W250\text{ W} + 420\text{ W} + 25\text{ W} + 65\text{ W} + 40\text{ W} = 800\text{ W}) and dividing by 0.800.80 to enforce the required 20%20\% safety overhead margin (800 W/0.80=1000 W800\text{ W} / 0.80 = 1000\text{ W}).

Adım Adım Çözüm

1
Calculate the total peak system power draw under maximum load
250 W (CPU peak)+420 W (GPU peak)+25 W (PCIe card)+65 W (Motherboard/RAM/SSD)+40 W (Cooling/Fans)=800 W250\text{ W (CPU peak)} + 420\text{ W (GPU peak)} + 25\text{ W (PCIe card)} + 65\text{ W (Motherboard/RAM/SSD)} + 40\text{ W (Cooling/Fans)} = 800\text{ W}
Sizing a power supply for high-performance workstations requires planning for full transient peak power excursions rather than static TDP values.
2
Apply the 80%80\% maximum continuous load limit requirement to find required PSU capacity
Required Capacity=800 W0.80=1000 W\text{Required Capacity} = \frac{800\text{ W}}{0.80} = 1000\text{ W}
To maintain system stability, operate near peak PSU efficiency curve, and prevent over-current protection (OCP) tripping during power surges, the peak system draw must not exceed 80%80\% of the PSU's total capacity.

Anahtar Kavram

Power supply sizing considerations including peak transient loads and headroom safety margins.
Tahmini Süre:2m 0s
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Expansion Cards and Power Supplies

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