The verdict

Local AI
Lenovo ThinkCentre M90q Gen 3 has a PCIe slot for a low-profile GPU - the other needs a DIY build for local LLMs.

Which wins for each job

Job Dell OptiPlex 7000 Micro Lenovo ThinkCentre M90q Gen 3
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR ~4 cameras ~4 cameras
Proxmox / VMs 16,359 PassMark 16,359 PassMark
Firewall / router 1 NICs 1 NICs
Local AI / LLM no slot PCIe GPU slot win

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 Dell OptiPlex 7000 Micro Lenovo ThinkCentre M90q Gen 3
Price (list) $330 $330
CPU Intel Core i5-12500T Intel Core i5-12500T
Cores / threads 6 6
PassMark 16,359 16,359
iGPU Intel UHD 770 Intel UHD 770
NICs 1 1
NIC model Intel I219-LM Intel I219-LM
RAM max (GB) 64 64
M.2 free 0 1
PCIe slot none x8-lp
Idle (W) 10 10
TDP (W) 35 35