another heatsink question - changing the pad
I'm working on an enclosure for the rockpro64.  The new version has provisions for active cooling but I'm having trouble with that and in testing found that the stock tall heatsink is almost enough.  It can run full throttle and just barely need throttling.  I'm thinking if I tried replacing the thermal pad with either some more exotic material or even just use thermal paste it would be enough.  Unfortunately the DRAM under the heatsink isn't as tall as the SOC so using a thermal paste wouldn't work for the DRAM.  

So I have a few questions.  Does the DRAM actually need cooled or is it just located so close to the SOC it was a matter of "why not?"  What have you tried to improve passive cooling?

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