A good PCIe 3.0 x4 NVMe M.2 2280 SSD with TLC NAND, DRAM, and Silicon Motion controller. There is some documented variance as to what controller, NAND, and speeds you get, but it is still an excellent deal at $100. Most drives with DRAM cache like this are $20 to $30 more.
Buyer beware: https://www.tomshardware.com/news/adata-and-other-ssd-makers-swapping-parts?
https://www.bestbuy.com/site/adat…Id=64233