The Phison 256GB M.2 2280 SSD (controller E13T) is a DRAM-less internal solid-state drive that uses the PCIe Gen 3x4 NVMe 1.3 interface. The specific performance characteristics can vary slightly depending on the exact NAND flash memory used by the manufacturer, but the general controller specifications are consistent.
Key Specifications
Feature SpecificationSource
Form FactorM.2 2280
InterfacePCIe Gen 3x4, NVMe 1.3
ControllerPhison PS5013-E13T
Capacity256 GB
Sequential ReadUp to 2300 MB/s
Sequential WriteUp to 1200 MB/s
Random Read (4KB)Up to 179K IOPS
Random Write (4KB)Up to 270K IOPS
NAND Flash3D TLC or QLC (varies by manufacturer)
DRAM CacheNo (DRAM-less, uses Host Memory Buffer)
Operating Temperature0°C to 70°C (32°F to 158°F)

I've left the heat sink on it