The verdict

CPU
Minisforum MS-A2 has 1.4x the CPU throughput (54,042 vs 37,699 PassMark).
Idle power
GEEKOM A9 Max idles lower (7W vs 25W) - cheaper to run 24/7.
Networking
Minisforum MS-A2 has more NICs (4 vs 2) - better for a firewall or VLAN trunk.
RAM ceiling
GEEKOM A9 Max takes more RAM (128GB vs 96GB).
Local AI
Minisforum MS-A2 has a PCIe slot for a low-profile GPU - the other needs a DIY build for local LLMs.

Which wins for each job

Job GEEKOM A9 Max Minisforum MS-A2
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR add a detector add a detector
Proxmox / VMs 37,699 PassMark 54,042 PassMark win
Firewall / router 2 NICs 4 NICs win
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 GEEKOM A9 Max Minisforum MS-A2
Price (list) $999 $639
CPU AMD Ryzen AI 9 HX 370 AMD Ryzen 9 7945HX
Cores / threads 12 16
PassMark 37,699 54,042
iGPU Radeon 890M (RDNA3.5) Radeon 610M (RDNA2)
NICs 2 4
NIC model Realtek 2.5GbE dual Intel X710 (10G SFP+)
RAM max (GB) 128 96
M.2 free 1 1
PCIe slot none x16
Idle (W) 7 25
TDP (W) 54 55