Question

A technician is configuring a high-performance workstation for video rendering. The system hardware specifications and peak power draws are as follows:
- CPU: $125\text{ W}$ TDP
- Dedicated GPU: $300\text{ W}$ peak draw (requires PCIe x16 bandwidth)
- PCIe Video Capture Expansion Card: $50\text{ W}$ peak draw (requires a minimum electrical bandwidth of PCIe x8 to prevent input lag)
- Motherboard, RAM, storage, and cooling fans combined: $75\text{ W}$ total

The installed motherboard features three expansion slots:
- Slot 1: Physical PCIe x16 (electrically wired as PCIe 4.0 x16 directly from the CPU)
- Slot 2: Physical PCIe x16 (electrically wired as PCIe 4.0 x8 directly from the CPU)
- Slot 3: Physical PCIe x16 (electrically wired as PCIe 4.0 x4 through the chipset, sharing bandwidth with an populated M.2 slot)

To prevent unexpected system shutdowns, the technician must size the power supply unit (PSU) with a mandatory $20\%$ power headroom overhead above total peak system consumption. Which continuous PSU rating and expansion card slot arrangement correctly satisfies all power and bandwidth requirements?