512GB NVMe - SK Hynix PC711 HFS512GDE9X073N (Gold P31), DRAM cache, M.2 2280 SSD
£45
Capacity = 512GB. TechPowerUp shows this SSD model as having a 512MB DRAM cache with read speeds of 3500MB/s and write speeds of 3100MB/s. The SSDs have had existing partitions deleted, wiped by writing 1 and 0 to every sector and then formatted.