The performance is close to the advertised sequential read speeds and slightly surpasses the sequential write rating. The AS SSD copy benchmark also shows excellent performance overall. Corsair built the MP400 series around the Phison PS5012-E12S controller, paired with Micron's 96-Layer QLC NAND Flash and NANYA's DDR3L SDRAM cache chips. This combination of components was a successful recipe allowing the California-based tech giant to offer a QLC-based drive capable of great levels of performance and stellar IOPS results for its class.