WD_BLACK NVME SN770M

Description

Key Features / Overview

• The SN770M is an M.2 2230 form-factor NVMe SSD, targeted especially at handheld gaming devices (e.g. Steam Deck, ROG Ally) and very slim laptops that support M.2-2230.

• Interface is PCIe Gen 4 ×4, backward compatible with Gen 3.

• Uses Western Digital’s TLC NAND (3D NAND, 112-layer BiCS5).

• DRAM-less design: uses Host Memory Buffer (HMB) instead, to reduce size and cost.

• 5-year limited warranty.

Performance & Endurance By Capacity

Physical / Other Specs

• Dimensions: 30 × 22 × 2.38 mm, weighs 2.8 g.

• Operating temperature: 0-85 °C

• Warranty: 5 years

Pros & Trade-offs

Pros:

• Very good sequential and random performance for its size; quite fast in read/write speeds, especially for gaming load times etc.

• Solid endurance, especially in the 1TB & 2TB versions.

• Compact form (M.2-2230) makes it ideal for devices with space constraints.

Trade-offs / Considerations:

• DRAM less with HMB means for some workloads the performance won’t match SSDs with onboard DRAM, especially in sustained heavy writes or when host OS can’t efficiently use HMB.

• Thermal throttling might be an issue in cramped enclosures (e.g. handhelds) under high disk usage, due to form factor / cooling constraints.

• Price per GB is often higher for premium performance & endurance in the 2TB version compared to cheaper QLC alternatives (though those often have lower endurance & slower write speeds).