Custom WD controller optimised for latency and DRAM-less design
Impressive performance on real world workloads
Recommended as a main OS and apps drive
Reviews:
https://www.tomshardware.com/reviews/wd-black-sn770-ssd-revi…
https://www.tweaktown.com/reviews/10055/wd-black-sn770-2tb-s…
WDS200T3X0E
Controller: WD
Memory: SanDisk BiCS5 112L TLC
DRAM Cache: N/A
Sequential Read: 5150 MB/s
Sequential Write: 4850 MB/s
Random Read: 650,000 IOPS
Random Write: 800,000 IOPS
Endurance (TBW): 1200 TB
Warranty: 5 Years
After the SLC cache saturated, the SN770 wrote at roughly 560 MBps for the remainder of the test. So, the nice benchmark tests are mostly testing the SLC cache.
The tests which show the weakness of DRAMless SSDs were not tested. Though most of those are probably not common end user usages.
If you are willing to spend a bit more, then for your "primary" PCIe gen 4 x4 SSD, is this really a great choice? The SSD controller is well tunes, but the actual NAND flash may not be that great.