Lights On, Temps Up? Coolmoon CM-M2A SSD m.2 NVMe Heatsink Review With temps up on modern SSDs, the need to keep modern Gen 5 SSDs cool has resulted in a market for m.2 heat sinks and there's a wide variety of choices to consider. Heat sinks of sizes large and small, in a variety of form factors and even with active cooling, are now available to keep your SSD cool. Today's review of Coolmoon's CM-M2A has colorful RGB lights on it to distinguish it from it's competition.