paul1976 The official public documents do not directly specify the PFC type of the built-in power supply for GTi13 Ultra (i9 13900HK).
If you really need this exact information, I can check with our technical team for you.
Important advice for your UPS selection:
We strongly recommend you choose a pure sine wave output UPS.
Modified / stepped sine wave UPS has risks when used with Active PFC power supplies. It may damage the PFC circuit, cause abnormal buzzing, random reboot or boot failure of your mini PC over long-term use.
We suggest a UPS rated at ≥300VA / 200W or higher.