The verdict

Plex
Nvidia RTX A5000 transcodes more streams (~24 vs ~12).

Which wins for each job

Job Nvidia RTX 4090 Nvidia RTX A5000
Plex transcode ~12 streams ~24 streams win
Frigate NVR ~25 cameras ~25 cameras
Local LLM 24GB VRAM 24GB VRAM
Fits a mini-PC full-size PCIe, DIY build full-size PCIe, DIY build

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 RTX 4090 Nvidia RTX A5000
Price (list) $1,900 $1,400
Type gpu gpu
Interface pcie pcie
Transcode H.264/HEVC/AV1 encode (NVENC Ada) H.264/HEVC (NVENC Ampere)
Frigate detector TensorRT TensorRT
TOPS - -
VRAM (GB) 24 24
Low profile no no
GPU sharing - vgpu
Power (W) 450 230