The verdict

Local AI
Nvidia Quadro P1000 has more VRAM (4GB vs 2GB) - up to ~7B (Q3-Q4).

Which wins for each job

Job Nvidia Quadro P1000 Nvidia Quadro P400
Plex transcode ~18 streams ~18 streams
Frigate NVR ~25 cameras ~25 cameras
Local LLM 4GB VRAM win 2GB VRAM
Fits a mini-PC low-profile PCIe low-profile PCIe

Approximate - capacity estimates from curated specs, the same logic as the recommender. Verify against your exact setup. Prices move; check the retailer.

Full specs

Spec Nvidia Quadro P1000 Nvidia Quadro P400
Price (list) $100 $60
Type gpu gpu
Interface pcie pcie
Transcode H.264/HEVC (NVENC Pascal) H.264/HEVC (NVENC Pascal)
Frigate detector TensorRT TensorRT
TOPS - -
VRAM (GB) 4 2
Low profile yes yes
GPU sharing vgpu (unlock) vgpu (unlock)
Power (W) 47 30