How RAM work well?

Problem: The metal heat spreader covering the module doesn’t touch all the chips.

Solution: Your best option is to send the RAM module back for replacement, if it’s still under warranty. If your warranty coverage has run out, you can try removing and reseating the heat spreader. Buy some double-sided thermal tape from an enthusiast site such as FrozenCPU .com. Next, carefully work off the heat spreader’s clips with a small screwdriver. Remove the metal heat spreader halves, then clean the old tape residue from it and the DIMM’s chips with isopropyl alcohol. If either heat spreader piece is bent, straighten it so that it will make better contact with the chips. Apply new thermal tape to the heat spreader halves, then attach them to the RAM module in the correct positions. Squeeze the spreader halves firmly over each pair of chips to help the thermal tape adhere, then reattach the spreader’s clips.