Introduction To date, we've tested several different brands of Phison E16-powered SSDs, and all have been impressive. Phison E16 Gen4 x4 powered SSDs have proven to be that fastest flash-based storage you can currently equip your AMD Zen II platform with. Today, we have TeamGroup's version of Phison's E16-powered powerhouse in the lab for evaluation. TeamGroup's T-Force Cardea Zero Z440 Gen4 x4 M.2 SSD is configured a bit differently than what we've seen to this point. The main difference is that instead of a large integrated heat sink that is common to E16 powered SSDs, TeamGroup is using an ultra-thin graphene and copper thermal label. This layered copper and graphene thermal label are surprisingly effective, providing up to 9c cooler temps, according to TeamGroup marketing.