The verdict

CPU
GMKtec EVO-X2 has 1.6x the CPU throughput (54,895 vs 34,991 PassMark).
Idle power
Beelink SER9 idles lower (8W vs 20W) - cheaper to run 24/7.
Networking
GMKtec EVO-X2 has more NICs (2 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
GMKtec EVO-X2 takes more RAM (128GB vs 32GB).

Which wins for each job

Job Beelink SER9 GMKtec EVO-X2
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR add a detector add a detector
Proxmox / VMs 34,991 PassMark 54,895 PassMark win
Firewall / router 1 NICs 2 NICs win
Local AI / LLM no slot no 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 Beelink SER9 GMKtec EVO-X2
Price (list) $999 $1,799
CPU AMD Ryzen AI 9 HX 370 AMD Ryzen AI Max+ 395
Cores / threads 12 16
PassMark 34,991 54,895
iGPU Radeon 890M (RDNA3.5) Radeon 8060S (RDNA3.5)
NICs 1 2
NIC model Intel I226-V Realtek 2.5GbE dual
RAM max (GB) 32 128
M.2 free 1 1
PCIe slot none none
Idle (W) 8 20
TDP (W) 65 140