While most motherboards have pre-installed M.2 heatsinks these days, users without one should not rush to buy one. SSD heatsinks weren’t always as common as they are today. People were using their Gen3 and Gen4 NVMe drives without heatsinks for years before marketing and motherboard designs changed everyone’s minds. Conventional wisdom about SSD heatsinks still revolves around thermal throttling instead of drive longevity, overblowing a problem most users don’t have. Unless you have a PCIe 5.0 SSD in your system running especially hot, you will be just fine without a heatsink. All you need is a PC with decent airflow and a drive that’s not being choked by adjacent components.