Solution
I am changing the heatsinks on my G,Skill Ripjaws ram and one side of the stick has no chips on it, just foam tape to fill the gap and I assume separate sensitive parts from the metal heatsink.
Where can I buy this and what is it called? Does it have any specific function like heat dissipation? its a few mm thick.

View: https://imgur.com/a/ud87JUj
That "foam" is not just a filler but also heat conducting to cool the circuit board.
Things like this https://www.amazon.com/performance-Thermal-Heatsink-Conductive-Silicone/dp/B00OUGX2V4
I am changing the heatsinks on my G,Skill Ripjaws ram and one side of the stick has no chips on it, just foam tape to fill the gap and I assume separate sensitive parts from the metal heatsink.
Where can I buy this and what is it called? Does it have any specific function like heat dissipation? its a few mm thick.

View: https://imgur.com/a/ud87JUj
That "foam" is not just a filler but also heat conducting to cool the circuit board.
Things like this https://www.amazon.com/performance-Thermal-Heatsink-Conductive-Silicone/dp/B00OUGX2V4
 
Solution