The Zero Fill test (at the top of the graphic) shows TLC blowing away the MLC competition. Zero Fill isn't a real-world test, it merely writes zero's to every address on the storage device.

The Ultra 3D and its nearly identical WD Blue 3D sibling are a step up from TLC drives in performance ... with the average MLC NAND SSD. The Sandisk Ultra 3D doesn’t displace the Crucial ...

The Blue 3D SSD is the first TLC NAND drive whose sustained write performance nearly matches that of MLC NAND drives ... but we didn’t see it. CrystalDiskMark tests the SSD with all caching ...

QLC – or quad-level cell – is the latest in a line of flash generations that began with SLC (single level cell, or one bit per cell) and progressed through MLC (two bits per cell) and TLC ...