I don't know if it's true or not, but I think RAM sinks help to WARM UP the ram on the side when under LN2 if you have some good air flow on them.
I don't understand the recommendations I see from some top guys about different types of grease on the ram chips to insulate from the cold. I think that under LN2 most of the cold comes from the cold PCB itself. When I've used eraser and left the surface of ram chips exposed, they start getting frost on them before I start to see any at the edge of the insulated pot.
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It exists!
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