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Sharing this article as I think it ties in with this conversation well: https://www.zdnet.com/article/cryogenically-frozen-ram-bypasses-all-disk-encryption-methods/
I do want to say that for most people, this is likely NOT a concern, but I don't know OPs threat model.
For those not clicking the link, "cryogenically frozen" actually means an upside down can of compressed air.
On the other hand, it's also worth noting that newer RAM generations are less and less susceptible to this kind of attack. Not because of any countermeasures, they just lose the data without constant refreshing much quicker even when chilled / frozen, so the attack becomes impractical.
So from DDR4 up, you're probably safe.