Get the Corsair RM750x PSU for £80 from Scan Computers (was £100) 750W of power is suitable for virtually anything these days, barring the likes of an RTX 4090 and such. Nvidia recommends a 700W ...

EVGA SuperNova GM power supplies provide up to 70.8A on a single rail! Full Suite of Protections This PSU will cover your circuits with complete protection: OCP, OVP, OTP, OPP, SCP, and UVP.

Excluding others and first generation AIO kits from Asetek, they have will have either volatile or persistent memory: NZXT and Corsair have volatile memory that persists as long as the PSU is left ...