The Fanxiang S770 is a solid-state drive in the M.2 2280 form factor, launched in 2022. It is only available in the 1 TB capacity listed on this page. With the rest of the system, the Fanxiang S770 interfaces using a PCI-Express 4.0 x4 connection. The SSD controller is the IG5236 (Rainier) from InnoGrit, a DRAM cache chip is available. Fanxiang has installed 176-layer TLC NAND flash on the S770, the flash chips are made by SK Hynix. Please note that this SSD is sold in multiple variants with different NAND flash or controller, which could affect performance, the "Notes" section at the end of this page has more info. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are soaked up more quickly. The cache is sized at 326 GB, once it is full, writes complete at 2163 MB/s. Copying data out of the SLC cache (folding) completes at 1200 MB/s. Thanks to support for the fast PCI-Express 4.0 interface, performance is excellent. The S770 is rated for sequential read speeds of up to 7,400 MB/s and 5,400 MB/s write.
At its launch, the SSD was priced at 85 USD. The warranty length is set to five years, which is an excellent warranty period. Fanxiang guarantees an endurance rating of 700 TBW, a typical value for consumer SSDs.