The verdict

CPU
Corsair AI Workstation 300 has 1x the CPU throughput (54,895 vs 54,042 PassMark).
Idle power
Corsair AI Workstation 300 idles lower (15W vs 25W) - cheaper to run 24/7.
Networking
Minisforum MS-A2 has more NICs (4 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
Corsair AI Workstation 300 takes more RAM (128GB vs 96GB).

Which wins for each job

Job Corsair AI Workstation 300 Minisforum MS-A2
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR add a detector add a detector
Proxmox / VMs 54,895 PassMark win 54,042 PassMark
Firewall / router 1 NICs 4 NICs win
Local AI / LLM PCIe GPU slot PCIe GPU slot

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 Corsair AI Workstation 300 Minisforum MS-A2
Price (list) $1,999 $639
CPU AMD Ryzen AI Max+ 395 AMD Ryzen 9 7945HX
Cores / threads 16 16
PassMark 54,895 54,042
iGPU Radeon 8060S (RDNA3.5) Radeon 610M (RDNA2)
NICs 1 4
NIC model Realtek 5GbE Intel X710 (10G SFP+)
RAM max (GB) 128 96
M.2 free 1 1
PCIe slot x4 x16
Idle (W) 15 25
TDP (W) 120 55