Medion support (who were excellent) have confirmed it's a hardware fault and have recommended I return to the retailer as DOA. I just hope the replacement arrives for Christmas! 😕 A bit of Googling confirms that NVidia RTX cards throttling to 210Mhz is a known issue caused by the chip which measures the power consumption of the GPU being broken and misreporting voltage and power consumption stats. This causes the card to lock down to a "safe" mode at it's lowest possible clock speed (hence why it's locked at 210Mhz).
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