edited: This is resolved, most (all?) of the cards reported here had incorrectly flashed bioses due to the use of DDR5, see W1zzard's excellent fix article over at techpowerup for a proper bios and full instructions - and GOOD LUCK!
If anyone cares, flashed cards wouldn't initialize ram after a cold boot (and we all know how often we cold boot our machines) so the failures appeared random. Easy mistake to make IMO.
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